What Does “20m” Mean on a Multimeter?

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So you have a multimeter, but what does that “20mV” mean on your multimeter’s display? What about other settings like “V,” “A,” and “Hz?” You probably know that “V” stands for volt, but what does “A” stand for? And why is “Hz” next to “V?” Don’t worry, we’ll go over everything and give you examples of when to use certain settings. 

The Meaning of 20m  

Ah, the multimeter. It is one of the most useful tools in your electronics tool kit and one of the most commonly used items in it. And yet, most multimeters have multiple settings and functions that can be a bit confusing. One such feature is the “20m” setting on many multimeters, which allows you to measure the current, voltage, and resistance of a component and wire combination (also known as a “measurement” or “circuit”). 

When you take a multimeter reading, you will often see a number followed by a “u” or “m”. It is a unit of measurement that tells you what the number refers to. The number “20m” means that it relates to the decimal place, so the number you’re looking at is an integer. However, the number “20u” would mean that it refers to the 20th microvolt, so it is a decimal number. 

What does 20m mean on a multimeter? Well, this is a common question that is often asked by those who are new to multimeters, because the meaning of the numerical value on the multimeter display can seem unclear. (It is said that “20” means the number of zeros that can be displayed after the decimal point.) “20” means that the resolution of the multimeter is 0.02 A, so 0.02A is displayed as 20.00, 0.04A as 20.00, 0.06A as 20.00, and so on. 

Understanding the meaning of 20m on a multimeter is not very difficult after learning about multimeters. A multimeter is used to measure voltage, current and resistance. 20m means that the multimeter can measure up to 20 milliamps of current, or the equivalent of 0.02 amperes. 20m on your multimeter can also mean dual range, meaning it has two ranges, one measuring up to 20 milliamps and the other up to 200 milliamps. 

Understanding your Multimeter 

Multimeters are the Swiss army knives of electronics. A jack of all trades. Although they do not have the different characteristics and functions of special test equipment, they can perform many test functions, including checking voltage, resistance, current and continuity.

This device is essential for working with circuits and electronic devices. It is an electronic measuring device used to measure various electrical signals such as current, voltage, resistance and capacitance. 

That’s why you need to familiarize yourself with multimeter symbols, because you’re bound to come across them at some point throughout your tinkering. The multimeter is used for educational and professional use. But always make sure you know the symbols and readings of the device before using it. 

The Second type of “20M” Reading

Multimeters are handy tools for testing electronic components and circuits. Almost every multimeter has an input resistance range of 20M or 20 megohms. This means that when you test the device, you can measure a certain range of values ​​without external resistance. 

This is because the internal resistance of the multimeter is many times smaller than that of a resistor of the same value as the resistance you are trying to measure. An input resistance value of 20M is a common choice because it is low enough to measure small resistances (below 100K ohms) but high enough to measure higher resistances (above 100K ohms). 

Multimeter Tips and Tricks 

Although a multimeter can be a very useful tool, there are some tips and tricks that you should keep in mind when using it. They are: 

  1. Always check the condition of the battery and make sure you have a new one. This will prevent your multimeter from dying in the middle of important measurements. 
  2. Another factor to consider is the multimeter settings. If you are not sure about the settings, read the user manual for more information about them. 
  3. The last thing you need to do is test the multimeter using it in the ohms setting and make sure it is calibrated correctly. If the multimeter is not properly calibrated, it can give false readings. 

The Multimeter can be a very useful tool when repairing electronic equipment, and there are many different types of multimeters available. When you start using the multimeter more often, you may find yourself confused by some of the functions and features. It is important to remember that a multimeter can test voltage, current, and resistance, but it can only test one of these things at a time. 

Things to remember when using a multimeter: 

When using a multimeter, always think of the device under test as a circuit. Also think of the multimeter as a separate part of the circuit. 


Measuring resistance is one of the most common tasks performed with a multimeter. This is because measuring resistance is a good way to locate electrical circuits and other electronic devices. If you know how to correctly interpret the resistance scale of a multimeter, you can quickly and easily check the condition of an electronic device. 

A multimeter is an electronic device used to measure voltage, current and other electrical properties. It is an absolute must for electronics enthusiasts and can be useful for electricians and other professionals who work with circuits every day. It is also a useful addition to any household toolbox since most homes today contain numerous small appliances with electrical components.  Along with a multimeter, you can troubleshoot faulty wiring or save yourself a few bucks by doing simple repairs.

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