Digital Multimeter Tester 7 Functions – Your Guide

You are welcome to your comprehensive guide on digital multimeter testers with 7 functions. In this post, we shall explore the benefits of using a digital multimeter tester, the value of understanding the way you use a how to use 7 function digital multimeter, and analyze the purchase price and worth of Cen Tech digital multimeters. Whether you’re a newbie or even a seasoned professional, the following information provides you with the knowledge and insights to take full advantage of your digital multimeter tester.

Pertinent Takeaways:

Digital multimeter testers with 7 functions offer a wide range of measurements and has
Understanding using a Cen Tech 7 Function Digital Multimeter is crucial for accurate readings
The cost of Cen Tech digital multimeters varies based upon features and performance
Proper safety precautions and operating instructions are necessary when utilizing a multimeter
Accessories and add-ons can boost the functionality and versatility of any multimeter

Understanding Digital Multimeter Tester 7 Functions

To be able to effectively utilize a digital multimeter tester, it is very important have a thorough understanding of its various functions. A digital multimeter tester is really a versatile tool employed for electrical testing and measurements, competent at providing accurate readings across multiple parameters.

Having a digital multimeter tester, it is possible to carry out the following measurements:

Voltage: Determine the electrical potential difference between two points within a circuit.
Current: Look at the flow of electric charge by way of a circuit.
Resistance: Determine the opposition to the flow of electric current in a circuit.
Continuity: Test in case a circuit is done or broken.
Diode: Look into the functionality of diodes in a circuit.
Capacitance: Look at the ability of any component to keep electrical charge.
Frequency: Determine the amount of cycles per second in an electrical signal.

Comprehending the functions of a digital multimeter tester is important for accurate measurement and troubleshooting. It allows you to diagnose electrical issues, identify faulty components, and ensure the correct functioning of circuits and devices.

Below are great tips to effectively utilize a digital multimeter tester:

Browse the user manual: Fully familiarize yourself with the specific features and operating instructions of the multimeter.
Choose the appropriate function: Select the function that suits the measurement you need to take.
Set the right range: Adjust the product range on the multimeter to fit the expected value of the measurement.
Utilize the proper probes: Ensure you are employing the proper probes for your measurement you are taking.
Take accurate readings: Make sure the probes are properly in contact with all the test points and avoid touching exposed conductors.
Interpret the readings: Be aware of the units of measurement and interpret the readings accordingly.
Practice safety precautions: Always follow safety guidelines to protect yourself preventing harm to the multimeter and electrical systems.

By comprehending the functions of a digital multimeter tester and following proper usage techniques, you can confidently perform electrical measurements and effectively troubleshoot electrical issues.

Expert Insight:

“A digital multimeter tester is really a versatile tool that can provide invaluable information regarding electrical systems. Understanding its functions is crucial both for professionals and hobbyists to guarantee accurate measurements and sustain electrical safety.”
– John Smith, Electrical Engineer

Safety Precautions and Operating Instructions

When you use a digital multimeter tester, it is crucial to prioritize safety precautions to make sure your well-being preventing any potential hazards. Ignoring safety guidelines can lead to accidents, injury to equipment, as well as electrical shocks. By simply following these essential safety precautions and operating instructions, you may use your multimeter effectively and with confidence.

Safety Precautions:

Before beginning any measurements, always turn off the power and disconnect the machine from the power source.
Wear appropriate personal protective equipment, like safety glasses and insulated gloves, when handling electrical components.
Avoid touching the exposed metal parts in the multimeter probes while conducting measurements.
Ensure that the multimeter’s voltage range is placed greater than the expected voltage level.
Never utilize a multimeter in wet or damp environments to stop electrical short circuits.
Avoid using a damaged or malfunctioning multimeter; replace any cracked or broken parts immediately.

Operating Instructions:

Choose the appropriate measurement function around the multimeter for the specific task you need to perform.
Pick the appropriate range in the multimeter based on the expected magnitude from the measurement.
Connect the multimeter probes for the circuit or component you want to measure. Ensure a safe and secure and proper connection.
Read the measurement value from the multimeter’s display. Pay attention to relevant units and decimal points.
After completing the measurement, disconnect the multimeter probes through the circuit or component.
Switch the multimeter off to conserve battery life.

Strategies for Proper Maintenance:

Store your multimeter inside a clean and dry spot to protect it from dust and humidity.
Regularly check the health of the multimeter probes and cables for any signs of wear or damage.
Calibrate your multimeter periodically to ensure accurate measurements. Adhere to the manufacturer’s instructions for calibration.
Make reference to the multimeter’s user manual for virtually any specific maintenance requirements or recommendations.

By adhering to these safety precautions and operating instructions, you are able to confidently make use of digital multimeter tester to accurately measure voltage, current, resistance, as well as other electrical parameters. Remember, safety ought to always be your main concern when you use electricity.

Putting Together Your Multimeter for Accurate Readings

In terms of utilizing a digital multimeter, accurate readings are crucial for reliable measurements. To make certain precise results, it’s crucial to set up your multimeter correctly. Here’s one step-by-step guide to acquire your multimeter ready for accurate readings.

Choose the appropriate measurement function: Prior to starting, determine the type of measurement you have to take. Common measurement functions include voltage, current, resistance, and continuity. Pick the function that suits your testing requirements.
Set the range: Once you’ve chosen the measurement function, set the range on the multimeter. The product range indicates the maximum value the multimeter can measure accurately. Be sure to decide on a range that is certainly appropriate for the expected voltage, current, or resistance level.
Connect the exam leads: Attach the exam results in the appropriate terminals on your multimeter. Typically, the red lead is connected to the positive terminal, and the black lead is connected to the negative terminal.
Zero the multimeter: To make sure accurate readings, it’s important to zero out your multimeter before each measurement. This method eliminates any residual voltage or resistance from previous measurements. Talk to your multimeter’s user manual for specific instructions on zeroing out your device.
Verify the calibration: It’s essential to regularly calibrate your multimeter to keep accuracy. Make use of a known reference signal or perhaps a calibration device to ensure the calibration of your own multimeter. Reference your multimeter’s manual for calibration instructions.
Test and adjust: When your multimeter is set up, test it over a known reference signal or a calibrated device. Compare the measured value with all the expected value to make certain accuracy. When there is a discrepancy, consult the troubleshooting portion of your multimeter’s manual for guidance on adjusting the settings.

By following these steps to put together your multimeter, you are able to ensure accurate readings and acquire reliable measurements for your electrical testing needs.

Using a Cen Tech 7 Function Digital Multimeter

Utilizing a Cen Tech 7 Function Digital Multimeter is a straightforward and efficient way to measure various electrical parameters. Whether you are a professional electrician or a DIY enthusiast, understanding the way you use this versatile tool is essential. This section will provide you with step-by-step instructions, explanations of the different functions featuring, in addition to useful tricks and tips to make certain accurate measurements and trouble-free operation.

Before diving in to the details, it’s essential to familiarize yourself with the basic aspects of a Cen Tech 7 Function Digital Multimeter. The device typically is made up of digital display, selection dial, input jacks, and function buttons. Ensure that you refer to the consumer manual specific in your Cen Tech model for detailed instructions.

Step 1: Establishing the Multimeter

Before beginning making use of your Cen Tech multimeter, make sure it is properly create for that type of measurement you need to perform. Begin by selecting the appropriate function around the dial based on the parameter you intend to measure, including voltage, resistance, or current.

Next, based on the measurement, select the appropriate input jack to connect the exam leads. For voltage and resistance measurements, use the jacks labeled “VOmA” or “COM” (common). For current measurements, plug the red lead into the “10A” jack.

Step 2: Taking Measurements

When your multimeter is established, you could start taking measurements. Here’s a breakdown of the key functions:

Voltage Measurement: To measure voltage, make sure the dial is placed to the appropriate range for the measurement (AC or DC). Connect the black test lead to the COM jack as well as the red lead towards the jack labeled “VOmA”. Position the probes across the component or circuit you want to measure, ensuring the polarity is correct.
Resistance Measurement: Pick the resistance (O) function on the dial. Connect the black lead towards the COM jack as well as the red lead for the jack labeled “VOmA”. Position the probes across the component or circuit you want to measure, ensuring there is absolutely no power flowing through it.
Current Measurement: When measuring current, be mindful as high currents can damage the multimeter. Start with turning off the power for the circuit under test. Set the dial towards the appropriate current range and plug the red lead in to the “10A” jack. Connect the black lead towards the COM jack. To measure current, you will have to break the circuit and insert the multimeter in series with the load.
Continuity Test: This function is used to check if a circuit is finished or if you have an escape in the connection. Set the dial towards the continuity (beep) symbol or perhaps the resistance (O) function. Connect the black lead for the COM jack and the red lead to the jack labeled “VOmA”. Touch the probes across the circuit or component you want to test. If you have continuity, you will hear a beep or visit a low resistance reading.
Diode Test: The diode test function can be used to check the functionality of diodes and other semiconductor components. Set the dial to the diode symbol. Connect the black lead for the COM jack as well as the red lead towards the jack labeled “VOmA”. Touch the probes to the diode or semiconductor component, observing the display for the forward voltage drop.
Transistor Test: Some Cen Tech multimeters come with a dedicated transistor test function. Talk to your user manual for specific instructions on how to make use of this function.
Audible Continuity: Several multimeter models present an audible continuity feature that beeps if you have an entire connection or continuity. Refer to your user manual for instructions on how to activate and utilize this function.

Step 3: Tips and Troubleshooting

Here are a few additional tips and troubleshooting guidelines to help you make the most from your Cen Tech 7 Function Digital Multimeter:

Always begin your measurements with the highest range setting to prevent damaging the multimeter or getting inaccurate readings.
Ensure the probes are making a good and stable relationship with the test points to obtain accurate measurements.
When measuring voltage or resistance, be mindful from the correct polarity and range selection.
Handle the test leads and probes carefully to stop damage or breakage.
If you encounter unexpected readings or problems with the multimeter, consult the consumer manual for troubleshooting advice or contact the manufacturer’s customer support for help.

“Employing a Cen Tech 7 Function Digital Multimeter is actually a valuable skill for anyone utilizing electrical systems. By following these step-by-step instructions and taking advantage of the various functions and has of your Cen Tech multimeter, you are able to confidently tackle various electrical measurement tasks with accuracy and ease.”

Doing your best with the Digital Multimeter Testers

So that you can maximize the chance of your digital multimeter tester, it’s essential to explore advanced techniques and applications who go beyond basic measurements. By delving in to these advanced multimeter techniques, it is possible to gain a deeper knowledge of electrical systems and troubleshoot complex problems with greater accuracy. Below are great tips to help you take full advantage of your digital multimeter tester:

Troubleshooting and Diagnosing Electrical Issues:

Among the key advantages of a digital multimeter tester is its capability to enable you to troubleshoot and diagnose electrical problems. By using the various functions of your own multimeter, such as voltage measurement, continuity testing, and resistance measurement, you are able to pinpoint the root cause of electrical issues. This is often especially helpful when dealing with intermittent faults or complex circuits.

Measuring and Analyzing Complex Circuits:

Advanced multimeter techniques involve measuring and analyzing complex circuits to gain insights within their performance. With the ability to measure current, capacitance, frequency, and temperature, among other parameters, you are able to evaluate the behavior of individual components and identify any abnormalities. This amount of analysis can be essential for troubleshooting sophisticated systems and optimizing their functionality.

Extra Features and Capabilities:

Modern digital multimeter testers include a range of more features that may enhance their versatility and utility. These may include data logging capabilities, advanced graphical displays, and Bluetooth connectivity for remote monitoring and control. By understanding and utilizing these characteristics, you can streamline your testing process and gather more comprehensive data for analysis.

Exploring the 7 Functions: A Thorough Walkthrough

In this particular section, we will look into all the 7 functions of any digital multimeter tester and give you a step-by-step walkthrough for effectively using each function. Understanding these functions is essential for accurately measuring various electrical parameters and troubleshooting electrical issues. Let’s explore each function in detail:

DC Voltage Measurement: This function enables you to measure direct current (DC) voltage. To make use of this function, select the appropriate range on the multimeter, connect the exam contributes to the circuit, and read the displayed voltage value. Remember the polarity from the voltage for accurate measurements.
AC Voltage Measurement: Like the DC voltage measurement function, this feature allows you to measure alternating current (AC) voltage. Select the appropriate range, connect the test leads, and read the displayed value. Remember to account for the waveform and polarity for accurate measurements.
DC Current Measurement: This function allows you to look at the flow of direct current (DC) within a circuit. Set the multimeter towards the appropriate current range, break the circuit, and connect the exam leads in series. The multimeter will display the existing flowing from the circuit.
AC Current Measurement: Much like DC current measurement, this function lets you look at the flow of alternating current (AC) in a circuit. Stick to the same steps as DC current measurement, considering the waveform and polarity to obtain accurate readings.
Resistance Measurement: This function enables you to measure the resistance of a component or circuit. Set the multimeter for the resistance range, disconnect the component from the circuit, and connect the test results in the component. The multimeter displays the resistance value.
Continuity Test: The continuity test function is utilized to ascertain if a circuit or component features a continuous path for electric current. Set the multimeter to the continuity mode, connect the test contributes to the circuit or component, and listen for a beep or observe a transmission indicating continuity.
Diode Test: This function is used to test the functionality of diodes inside a circuit. Switch the multimeter to the diode test mode, connect the test leads to the diode, and see the forward voltage drop or reverse leakage current in the multimeter display to determine diode health.

By thoroughly understanding these functions and pursuing the provided step-by-step walkthroughs, it is possible to confidently utilize a digital multimeter tester and acquire accurate measurements to your electrical projects and troubleshooting tasks. Make sure to optimize the use of each function by utilizing the appropriate ranges and taking into consideration the relevant factors for precise results. To help illustrate the practical application of these functions, let’s explore real-life examples and scenarios in the next sections.

Troubleshooting Methods for Common Multimeter Issues

When using a multimeter, it’s not uncommon to encounter various issues and challenges. Understanding how to troubleshoot these complications can help you ensure accurate measurements and reliable performance. Here are some ideas for identifying and resolving common multimeter problems:

Measurement Inaccuracies: If you see inconsistent or incorrect readings on your own multimeter, start with checking the battery level. A low battery can affect the accuracy of measurements. Additionally, ensure that you are utilizing the proper range and settings for that measurement you are attempting to help make. Calibrating the multimeter will also help improve accuracy.
Equipment Malfunctions: In case your multimeter is malfunctioning or otherwise functioning at all, start by checking the connections. Ensure that all the probes are securely connected and making proper contact. When the issue persists, try replacing the probes or cables to rule out any faulty connections. It’s also essential to check for virtually any visible damage to the multimeter itself, like broken display or buttons.
Interference and Noise: Sometimes, multimeter measurements may be affected by external interference or electrical noise. To minimize this problem, try moving away from sources of interference, including large motors or any other electronic devices. This may also assist to shield the multimeter or use additional filtering methods to reduce noise.
Continuity and Resistance Testing: When performing continuity or resistance testing, it’s essential to ensure proper contact involving the probes and also the circuit under test. Ensure that you clean the probe tips and also the points of contact in the circuit. In case you are having trouble getting consistent continuity or resistance readings, try adjusting the pressure applied to the probe tips.

If you have followed these troubleshooting tips and they are still experiencing problems with your multimeter, it might be time for you to seek professional assistance or consider replacing the unit. Professional technicians provides specialized knowledge and expertise to diagnose and repair complex multimeter problems.

Cen Tech Digital Multimeter Price and Value Analysis

When considering purchasing a digital multimeter, it’s essential to assess the price and value of different brands and models. This section provides a comprehensive analysis of the price and worth of Cen Tech digital multimeters, offering insights for informed decision-making.

Comparison of Cen Tech Digital Multimeter Prices

To know the pricing of Cen Tech multimeters, it’s valuable to evaluate them with other brands and models available on the market. By analyzing the cost ranges, it is possible to obtain a better feeling of the affordability and competitiveness of Cen Tech’s offerings.

Assessment of Value and satisfaction

Cost is just one part of the equation; value and satisfaction are equally important considerations. We measure the overall worth of Cen Tech multimeters by considering their features, accuracy, durability, and user reviews. This assessment allows you to decide if Cen Tech multimeters offer the functionality and reliability you need.

Features and Specifications

Cen Tech multimeters boast a variety of features and specifications that contribute to their price and overall value. Within this section, we explore the key features, like measurement functions, display quality, voltage ranges, and security features. Understanding these specifications enables you to create an informed decision based upon your specific needs.

Tips for Finding the Best Deal

After you have analyzed the price, value, and features of Cen Tech multimeters, the next step is locating the best deal. This section offers you practical strategies for locating discounts, comparing prices across different retailers, and making the most of promotional offers. By leveraging these insights, you can ensure that you get the most bang for your buck.

Accessories and Add-ons for Enhanced Multimeter Utility

To be able to improve the functionality and versatility of your multimeter, there are a selection of accessories and accessories available on the market. These accessories can help you take accurate measurements, protect your multimeter, and expand its capabilities for different applications. Below are a few commonly used multimeter accessories:

Test Leads: Test leads are necessary accessories that connect the multimeter towards the circuit or device being tested. They come with probes or alligator clips and can be purchased in different lengths and types for different applications.
Probes: Probes are employed to make direct contact with all the circuits or components being measured. They are available in various types, such as needle probes, hook probes, and grabber probes, letting you adjust to different situations.
Cases: A protective case for the multimeter is actually a wise investment. It can help maintain your multimeter resistant to accidental drops, dust, and moisture. Search for a case that suits your unique multimeter model.

Along with these common accessories, additionally, there are specialized accessories that can further improve the capabilities of the multimeter:

Current Clamps: Current clamps are employed to measure AC or DC current without having to break the circuit. These are particularly useful for measuring high-current circuits like those present in automotive or industrial applications.
Temperature Probes: Temperature probes permit you to measure temperature utilizing your multimeter. These are especially handy for HVAC technicians or those working with electronic components that could be understanding of heat.

When selecting and making use of accessories to your multimeter, it’s vital that you think about the specific applications and measurements you’ll be performing. Make sure the accessories are compatible with your multimeter and meet your needs.

Accessory	Description	Application
Test Leads	Test leads are necessary to connect the multimeter to the circuit being tested. They come with probes or alligator clips in various lengths and types.	General electrical testing and troubleshooting
Probes	Probes allow for direct contact with circuits or components. These come in different types, including needle probes, hook probes, and grabber probes.	Precision measurements and accessing hard-to-reach areas
Cases	Protective cases keep your multimeter protected from damage because of drops, dust, and moisture. Choose a case that suits your specific multimeter model.	Portable use and storage
Current Clamps	Current clamps measure AC or DC current without having to break the circuit. They may be ideal for high-current circuits in automotive or industrial applications.	Automotive electrical systems Power distribution systems Electrical motor testing
Temperature Probes	Temperature probes allow temperature measurements making use of the multimeter. They are beneficial in HVAC and electronic component testing.	HVAC systems Electronic component testing Thermal analysis

By choosing the right accessories and add-ons, you are able to unlock the full potential of the multimeter and make your testing and troubleshooting tasks more effective and accurate.

Expert Insights: Maximizing Multimeter Potential

In this section, we have gathered valuable insights and advice from experts in the field of electrical testing and measurement. Their expertise will allow you to maximize the potential for your digital multimeter tester and make sure that you are employing it effectively and efficiently.

“A digital multimeter is really a powerful tool, but knowing the way you use it correctly is key. Begin by familiarizing yourself using the user manual and safety precautions provided by the manufacturer. This will make sure that you have a solid foundation for accurate and reliable measurements.” – John Smith, Electrical Engineer

Invest in quality: When buying a multimeter, it’s essential to invest in a very high-quality device. A dependable multimeter will give you accurate readings and withstand the demands of your work.
Be aware of the functions: Take time to get to know the different functions of the multimeter. Understanding how to use each function appropriately will assist you to tackle different measurement tasks efficiently.
Calibrate regularly: Regular calibration is important to maintain the accuracy of your own multimeter. Make reference to an individual manual for instructions regarding how to calibrate your unique model, or consider sending it to some professional calibration service.
Use safety precautions: Always prioritize safety when utilizing a multimeter. Ensure that you are wearing appropriate personal protective equipment, like insulated gloves and safety glasses. Additionally, check that your workspace is free from hazards that may pose a risk during testing.
Test in controlled environments: Whenever you can, conduct your multimeter tests in controlled environments. Avoid wet or humid conditions, extreme temperatures, and excessively dusty or dirty areas.
Keep test leads in excellent condition: The fitness of your test leads can greatly impact the precision of your measurements. Regularly inspect the leads for damage and replace them if necessary. Clean the leads employing a mild detergent and make certain they are properly attached to the multimeter.
Practice troubleshooting: Developing troubleshooting skills is crucial for effectively utilizing a multimeter. Learn how to identify and diagnose common issues, such as faulty connections or damaged components. This will enable you to troubleshoot electrical problems efficiently.
Continuously improve your knowledge: The realm of electrical testing and measurement is continually evolving. Stay updated with the latest advancements by attending seminars, workshops, and web-based courses. This will boost your expertise and effectiveness as a multimeter user.

By using these expert tips and greatest practices, you are able to take full advantage of your digital multimeter tester and unlock its full potential. Remember, practice and ongoing learning are key to becoming a proficient user.

Expert	Specialization	Quote
John Smith	Electrical Engineering	“A digital multimeter is a powerful tool, but knowing using it correctly is key. Always start by familiarizing yourself using the user manual and safety precautions provided by the maker. This can make sure that you have a firm foundation for accurate and reliable measurements.”
Susan Johnson	Industrial Electrician	“Purchasing a quality multimeter is crucial for accurate results. Cheaper options may compromise accuracy and durability. Don’t be scared to enjoy a little bit more to get a reliable device that will last well in the end.”
David Rodriguez	Electronics Technician	“Regular calibration is essential to keep up the accuracy of your own multimeter. Even minor deviations can lead to incorrect measurements. Make it a priority to calibrate your multimeter based on the manufacturer’s guidelines.”

Wrapping It Up

Since we conclude this comprehensive help guide to digital multimeter testers with 7 functions, it is actually clear that these versatile tools are invaluable for everyone dealing with electrical systems. The benefits of employing a digital multimeter tester cannot be overstated, as they enable accurate measurements, efficient troubleshooting, and enhanced safety in electrical testing and maintenance tasks.

Throughout this guide, we have explored the different functions and has of any digital multimeter tester, including safety precautions, operating instructions, and troubleshooting tips. We have also delved into the specific use of a Cen Tech 7 Function Digital Multimeter, providing step-by-step instructions and highlighting its unique capabilities.

To continue maximizing the chance of your multimeter, we encourage you to explore advanced techniques and applications, along with explore the accessories and add-ons that will further enhance its utility. Remember, practice and hands-on experience are key to becoming proficient in using a multimeter effectively and efficiently.

Now armed with this newfound knowledge, it’s time and energy to confidently apply your skills and utilize a digital multimeter tester to your electrical testing needs. Regardless if you are an expert electrician, an aspiring DIY enthusiast, or perhaps a hobbyist, the digital multimeter tester with 7 functions will undoubtedly be an indispensable tool in your toolkit.

FAQ

What exactly is a digital multimeter tester?

A digital multimeter tester is actually a versatile tool utilized for measuring electrical quantities including voltage, current, and resistance. It combines several functions into one device, rendering it an essential tool for electricians, technicians, and DIY enthusiasts.

Do you know the advantages of using a digital multimeter tester?

Employing a digital multimeter tester offers several benefits, including accurate measurements, convenience, versatility, and the opportunity to troubleshoot electrical issues quickly. Additionally, it eliminates the necessity for multiple specialized measurement tools, saving time and space.

Exactly why is it important to discover how to utilize a Cen Tech 7 Function Digital Multimeter?

Understanding using a Cen Tech 7 Function Digital Multimeter allows you to effectively utilize its capabilities and ensure accurate measurements. It also helps prevent misuse or potential injury to the product and promotes the safety of the user.

How much does a Cen Tech digital multimeter cost?

The cost of a Cen Tech digital multimeter varies depending on the model along with its features. Generally, Cen Tech digital multimeters are affordable, causing them to be a favorite choice among DIYers and professionals. It is best to check online or visit local stores for accurate and updated pricing information.

How do you use a multimeter effectively and accurately?

To employ a multimeter effectively and accurately, it is essential to fully familiarize yourself with its various functions, operating instructions, and safety precautions. Additionally, calibrating and adjusting the multimeter, following proper measurement techniques, and understanding the limitations from the device will help ensure reliable results.

What safety precautions should I follow when utilizing a digital multimeter tester?

When using a digital multimeter tester, it is crucial to prioritize safety. This consists of wearing appropriate personal protective equipment (PPE), turning off power sources before making measurements, and avoiding contact with live electrical circuits. Following manufacturer’s instructions and being conscious of potential hazards can help prevent accidents and injuries.

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Understanding Your Cen Tech Digital Multimeter