Klein MM400 vs. MM600: Which Multimeter is Better?

Klein MM400 vs. MM600: Which Multimeter is Better?

Are you in the market for a new multimeter? If so, then you may have heard of Klein Tools and their two models, the MM400 and MM600. These models are similar in many ways, but there are also some key differences that could influence your buying decision. In this article, we’ll compare the features of both these devices to help you decide which multimeter is the better fit for you.

What is a Klein MM400 Multimeter?

The Klein Tools MM400 is a digital multimeter designed for both professional and DIY use.

What is a Klein MM400 Multimeter?

It offers six functions: measuring AC/DC voltage, resistance, continuity, diode test, capacitance, and temperature. The LCD display has an integrated LED backlight so you can read easily in low light conditions. Additionally, the device features data hold function to capture important readings and a low battery indicator. [1]

What is a Klein MM600 Multimeter?

Klein MM600 is a multimeter that can be used for many different purposes. It has advanced features such as non-contact voltage detection, temperature measurements, diode testing and continuity testing. The multimeter also comes with a large LCD screen, data retention and relative mode. This makes it easier to read the results and compare them to previous readings. It is also designed to be durable and comes with a long-lasting 9V battery. [1]

Why is it Important for Electrical Workers?

For any electrical professional, having the right multimeter is essential. That’s because a multimeter allows them to troubleshoot and repair various types of electrical systems. It’s important for an electrician to have a reliable, accurate, and easy-to-use digital multimeter that can measure current, voltage, frequency, resistance, and other factors. [1]

Technical Features Of The Klein MM400

The Klein MM400 and MM600 are two popular multimeters that you’ll find in the electrical toolbox of many professional electricians. But which one should you choose? Both models have some great features that make them ideal for troubleshooting electrical systems, but there are also some differences between them that can affect your decision. Let’s take a closer look at the features of the Klein MM400 and MM600 to help you make an informed choice.

The Klein MM400 is a digital multimeter that has an LCD display for easy reading and four different function ranges. It can measure AC/DC voltage, resistance, capacitance, continuity, temperature, diode testing, frequency measurements and more. [1]

Product description of mm400 multimeter

The Klein MM400 is a heavy-duty autoranging multimeter that packs a lot of features and power into its small, handheld size. It operates with two AAA batteries, which makes it easy to carry around and use in the field. This device can measure AC/DC voltage up to 600V, AC/DC current up to 10A, resistance up to 40MΩ, and capacitance up to 10,000µF. It also offers diode testing, continuity testing with buzzer, low-pass filter for accurate AC voltage readings, and True RMS measurements. [1]

Benefits of using Klein tools MM400

Klein Tools offer a range of multimeters for different jobs. The MM400 and MM600 are two popular models with distinct advantages.

The Klein MM400 is a great choice for electricians who need an accurate, reliable and easy-to-use device. It has automatic ranging, making it simple to use even for those who have limited experience with multimeters. It also features a backlit display that allows you to take readings in low-light conditions and an ergonomic design that fits comfortably in your hand.

Benefits of using Klein tools MM400

The MM400 is designed with safety in mind, featuring CAT III 600V/CAT IV 300V overvoltage protection. This ensures the device is safe to use on circuits up to 600V and provides a high degree of protection against damage. It also has a built-in continuity and diode tester, making it an even more versatile tool for electricians. [1]

Disadvantages of using Klein tools MM400

While both the Klein tools MM400 and MM600 have their advantages, there are some drawbacks that need to be considered when choosing which model is best for you.

First, both models of multimeters require a 9V battery in order to operate. While this may not seem like much of an inconvenience, it can add up over time if the battery needs to be replaced or recharged frequently.

Second, while both models of multimeters offer a wide range of features and functions, the MM400 may not have all the bells and whistles that are included with the MM600 model. For example, some of the advanced features on the MM600 include an auto-hold feature for recording readings as well. [1]

Technical Features Of The Klein MM600.

The Klein MM600 is a digital multimeter that has the capability to measure voltage, current, resistance and capacitance.

It also has a range of other features such as diode test, continuity test and temperature measurements. The MM600 has an AC/DC voltage range up to 600V, whereas the MM400 only goes up to 400V. [1]

Product description of MM600 multimeter.

The Klein MM600 is a true-rms multimeter that is designed for professional electricians and technicians. It has the ability to measure AC/DC voltage, continuity, resistance, capacitance, frequency (Hz), duty cycle (%), and temperature with a maximum 10A overload protection. The MM600 offers an enhanced safety rating of CAT IV 600V / CAT III 1000V. This multimeter also features an integrated non-contact voltage detection and a large white LED backlight for easy visibility in dark places. The display can show the true average value of a signal, which makes it ideal for fluctuating loads or noisy environments. [2]

Product description of MM600 multimeter.

Benefits of using Klein tools MM600.

If you’re looking for a high-quality, reliable multimeter that will give you accurate readings time and time again, then the Klein Tools MM600 is a great choice. Here are some of the benefits of using this tool:

  • Easy To Use: The Klein Tools MM600 features an easy to read backlit display with simple navigation buttons, making it easy for novice users to use. The multimeter also has multiple settings and functions that are easily accessible and adjustable with the push of a button.
  • Accurate Readings: The Klein Tools MM600 features an autoranging scale which allows you to take measurements quickly and accurately. It also features True RMS technology for measuring AC electrical variables and temperature readings.
  • Durable Design: The Klein Tools MM600 is built to last, with a rugged outer shell that can withstand drops and shocks. It also features an ergonomic design which makes it comfortable to hold during long-term use.
  • Versatile: With its 10 Amp range selection, the MM600 is suitable for a variety of applications, including auto diagnostics, electrical troubleshooting and HVAC/R maintenance. [2]

Disadvantages of using Klein tools MM600.

The Klein MM600 is not without its drawbacks. One of the main drawbacks is that it does not have a true RMS capability, meaning it cannot accurately measure AC signals with varying amplitudes and frequencies. As such, it can be difficult to use in situations where precise measurements are required of these types of signals. Additionally, the display screen on the MM600 is quite small and can be hard to read in low-light conditions. Finally, the Klein MM600 does not have an auto-ranging feature, meaning the user must manually select the correct range for every measurement. This can be tedious and time consuming compared to other multimeters with auto-ranging capabilities. [2]


No matter which multimeter you choose, safety should always be your top priority. If the job requires working in tight spaces, then a smaller, more compact model like the Klein MM400 might be better suited than the larger Klein MM600. Both models feature double insulation and protection against reverse polarity as well as other features to protect users from electric shock. However, if you’re working with high voltages, then the Klein MM600 is a better choice since it has greater accuracy and can measure up to 600 volts.

For both models, always read the instructions before use and ensure that all necessary safety protocols are followed. It’s also important to use caution when handling live electrical components. [2]


It’s important to keep in mind a few warnings when using either the Klein MM400 or MM600 multimeters.

First of all, be sure to disconnect any electrical appliances that you plan to test with the multimeter before you begin testing. This will help protect both you and your multimeter from electrical shocks.

Additionally, if the multimeter has a disadvantage of measuring high voltage, be sure to use the proper safety equipment such as rubber gloves and safety glasses. Both the Klein MM400 and MM600 are insulated, however it is still important to take extra precautions when dealing with high voltage circuits.

Finally, always store your multimeter in a dry location away from extreme temperatures or direct sunlight. [2]



Does Klein make a good multimeter?

Klein is a trusted brand in the electrical industry. Their multimeters are reliable and accurate, making them ideal for use in industrial, commercial, residential, or educational settings. They offer a wide range of models to suit different needs, and their MM400 and MM600 models are two of the most popular.

What is the maximum voltage for Klein MM400?

The Klein MM400 is a digital multimeter that can measure up to 600 volts (AC/DC) and 10 amps. It also includes features such as continuity, frequency, capacitance, and diode testing. The LCD display shows true RMS readings for AC voltage and current measurements.

Can Klein multimeter MM600 read DC?

Yes, the Klein MM600 can measure DC voltage and current to 600 volts and 10 amps. It also has a built-in temperature probe, making it an ideal choice for HVAC/R technicians. The data hold function makes it easy to keep track of important readings, and the backlit LCD display ensures clear readings in any environment.

Is Fluke better than Klein?

It really depends on the specific application. Both Fluke and Klein offer high-quality multimeters, but they each have different strengths. For example, the Fluke 87V is a general purpose digital multimeter that measures AC/DC voltage and current, along with resistance, capacitance, frequency, and temperature.

Which brand multimeter is best?

The best multimeter for your needs depends on the specific application.

You should consider factors such as accuracy, durability, safety features, user-friendliness, and cost when choosing a multimeter.

Ultimately, it is important to choose a model from a reputable brand that is suitable for the task at hand.

Which multimeter is best?

It is difficult to say which multimeter is best without knowing the specific application. In terms of accuracy and features, both Klein MM400 and MM600 are excellent choices. The MM400 offers up to 600 volts (AC/DC) and 10 amps with a built-in temperature probe, while the MM600 has a backlit LCD display for easy reading in any environment. Ultimately, you should choose the model that is best suited to your needs.

How do I choose a multimeter?

When choosing a multimeter, it is important to consider several factors. You should make sure the multimeter is suited for the task at hand and that it can measure up to the voltage and current requirements of your application. Additionally, you should ensure that it has all the features necessary for your job such as continuity testing or temperature probes.

What multimeter should I buy as an electrician?

If you are an electrician, you should look for a multimeter with high accuracy and durability. The Klein MM600 is an excellent choice as it can measure up to 600 volts (AC/DC) and 10 amps, has a backlit LCD display, and features such as continuity testing and temperature probes.

Why is Fluke so expensive?

Fluke multimeters are known for their accuracy and durability, making them ideal for industrial, commercial, residential, or educational settings. They also have features such as True RMS readings, data hold functions, and temperature probes. Because of the high-quality materials used in manufacturing and the range of features offered, Fluke multimeters tend to be more expensive.

Useful Video: KLEIN MM400 Multimeter Review & Teardown!


When it comes to deciding between the Klein MM400 and MM600, it comes down to what type of user you are. The MM400 is a great choice for general use, while the MM600 is best suited for more advanced applications. Both multimeters offer reliable performance, accurate measurements, and features that make them easy to use. No matter which one you choose, you can be sure that it will help you get the job done.

We hope this article has provided you with all of the information needed to make an informed decision when selecting a multimeter. By taking into account your needs and budget, you should have no problem deciding between the Klein MM400 vs. MM600. Happy measuring!


  1. https://www.electronicmultimeter.com/best-klein-multimeter/
  2. https://bestmultimeterreviews.org/klein-mm400-review/