Klein Tools MM400 Vs MM600 Multimeter Review Comparison 2023!

Klein Tools MM400 Digital Multimeter

Klein Tools MM600 HVAC Multimeter

  • Good Quality
  • Auto Ranging
  • Easy to Use
  • Budget Friendly
  • Backlit Display
  • Strong Construction

Currently we have come across the two most incredible products Klein mm400 Vs mm600. Both come with rugged construction, having enough capability to measure current, voltage, resistance, frequency up to a certain limit. Here we compiled Depth details of Klein Tools MM400 Vs MM600 Multimeter Review.

Klein Multimeter is one of the excellent brands that always come up with budget-friendly multimeters. The amazing thing about them no matter whatever the price is this company never compromises on the quality.

They always try best to provide the ultimate features and high-quality product to their customers. Moreover, these devices have auto-ranging features, LCD, backlight, and clear display.

However, you can also measure the temperature with them. The most attractive part is you can get all the basic features at such an affordable rate. In this article "Klein Tools MM400 Vs MM600 Multimeter Review" we will provide a detailed comparison including the similarities as well as differences between these two budget-friendly multimeters.

Who can use Klein MM400 and MM600 Multimeter?

Before moving forward let me put some light on the most important part that helps you to decide whether you should buy it or not.

Most of you are here to check the review to order the one that suits you. But before jumping forward please have a look below to find whether these products are for you or not.

i). Hobbyists/DIYer

Do you love to deal with electronic stuff to diagnose the issues and correct them with your skills? Are you looking for a device that suits perfectly the DIYers? Well, you have landed at the very right place.

Klein MM400 and Klein MM600 both are best for residential users. Due to the low cost and user-friendly features, you will not need any professional to guide you. The interesting thing is these products are safe to use. However, there are few differences which we will discuss below make sure to check them before making any decision.

ii). Commercially

No doubt both products are equipped with some basic yet useful features but still, there is some limitation. You can keep any of these items as a backup in case of any emergency.

But it is strictly not allowed to use them to measure the high-end capacitance, temperature, voltage, or current. These devices can measure the current, voltage, resistance, capacitance, temperature up to certain limits which will mention below in a chart.

Check them to buy anyone that you like as per your requirement and budget.

ii). Beginner

Are you new to the world of electronics? Do you need a device that is user-friendly yet affordable? Well, you have arrived at the very right place. We are here with two excellent devices which are available at low cost but embedded with all the important features.

Don't worry you will not face quality issues and any complications. Why spend so much on high-end products when you can get the same basic features at a low cost?

Difference between MM400 vs MM600 :

Features

Klein Tools MM400 

Klein Tools MM600

AC/DC Voltage

This is only capable of measuring the AC/DC voltage up to 600V.

This multimeter has capability to measure the voltage up to 1000V.

Batteries

It required 2 AAA batteries.

The multimeters come with 2 AAA batteries.

Capacitance

40-200µF

40-4000µF

Current

Measures Up to 10A.

Measure Up to 10A.

Frequency

10Hz-50KHz

1Hz-50KHz

Do the batteries included in package?

NO

YES

Auto Ranging

YES

YES

Item Weight

10.6 ounces

10.6 ounces

Product Dimensions

1.8 x 3.1 x 6 inches

10 x 5.6 x 2.7 inches

Klein Tools MM400 Vs MM600 Multimeter Review Features:

Following are the features Klein Tools MM400 and MM600 Multimeter:

a). Quality

Klein tools come with strong construction and well built. Both tools by Klein are considered as an all-rounder for all those who are into this electronic world. However, mm600 came after mm400 so the quality is more than the older version.

In terms of usability, mm600 falls between mm400 and mm700. However, don't expect the highest accuracy from these devices because they do not claim it right?

Despite this, these devices are good at performing all the essential functions and providing accurate measurements up to some extent only.


Klein mm400 contains the cheaper yet easy to get fit batteries called AAA. It was designed by the electricians and considered the most easy-to-use device. This product does what it stays like measuring current, voltage, capacitance, and temperature but up to a certain limit.

MM400 is mainly a strong device that comes with a sturdy rubber holster that keeps it safe from any falls. This device can easily handle the drop from 1m. Additionally, the product is quite handy and durable. 

It has a rugged flip-out stand with strong rubber feet that aids you in performing hands-free operations. The dial of this multimeter is quite interesting allows the user to perform the tasks with one hand without any hassle. It has large buttons which are quite easy to press.

Klein mm400 is Digital Multimeter which has a separate compartment for the batteries which makes it easy for a user to change the batteries in case of any issue.


As compared to Klein mm400, the other product Klein mm600 have strong buildup and have enough capability to combat with the drop from six foot. It has such a chunky and rugged case as well as a holster that keeps the device safe during falls.

You can easily use the dial as it is quite rugged plus simple to turn. Due to this feature, one can even operate the tool with a single hand without any hassle. The fuses and batteries of this product can be easily replaced through the compartment.

b). Display

The next is the display of these two smart affordable devices. Unfortunately, the MM series by Klein does not have any superb duper high resolution but that doesn't mean the display is of bad quality or unclear.

Both devices come with a resolution of 4000 counts that is considered standard. They have the same sampling rate that is three times a second. However, all the important units are displayed on the screen what else you need.

These devices showed up with the backlight display which makes it easy for the users to take the measurements even at night or in darker areas. Whether you want to hold the data or need to start the auto-ranging every function is displayed on the screen with a separate button.

c). Performance

These devices do not disappoint when it comes to functionality. Both are embedded with the max/min mode, relative mode, auto-ranging, an auto-hold feature.

In mm400 you will be facing a bit of lag in the continuity as well as capacitance. This is due to the cheaper price of mm400. Min/Max mode is the useful one that helps you to find the discrepancies in the given signal by storing the high/low values.

With the auto range button, the user can easily switch the mode from manual to automatic according to the requirement.


Both tools have auto power-off features that help to save battery life. How? The tool will get off automatically after 15-30 minutes of not being used. Some people overlooked this feature but it is useful for those who have a habit of leaving things switched on.

Klein mm600 has warning beeps that sound when you cross the certain limits mentioned in the technical specification. Honestly, the auto-ranging speed and continuity issues always occur on the low-budget tools.

But apart from those few errors you can easily take the basic measurement and diagnose the issues on the go. Both of these devices are reliable and durable to use.

d). Protection

The next important feature which matters the most is the protection of the user. Whenever we are going to purchase a new multimeter the foremost factor that strikes our mind is safety right? No matter whatever is the price you can still get complete safety while using the tools.

Klein mm600 is certified with CAT-IV rating at 600V while Klein mm400 comes with CAT-III 600V certification that protects the device from over-voltage.

d). Easy to use

If have been through difficulties while using a multimeter then these are for you. Both multimeters are quite easy to use so you will not need any assistance from a professional or guide. You can easily insert the leads due to the clear signs created on them.

MM600 HVAC Multimeter is the best option for those who do not want to spend a lot on multimeters but need a superb device for HVAC work while mm400 is best for those who are looking for a multimeter to perform the daily tasks in an affordable range. It is also good for the beginners.

Klein Tools MM400 Vs MM600 Multimeter Review Features Summary:

Features

Klein Tools MM400 Digital Multimeter

Klein Tools MM600 HVAC Multimeter

Accuracy

YES

YES

Data Hold

YES

YES

Auto ranging

YES

YES

Auto Power Off

YES

YES

Display

Backlit Clear Display 

Standard resolution, good display with backlit.

Low Battery indicatory

YES

YES

Quality

Strong buildup and good quality. Combat drops from 3 foot due to rubber holster.

Sturdy construction, high quality with the capability to withstand drops from 6 foot.

Klein Tools MM400 Pros Vs. Cons:

Read Customer Reviews Here >>

Pros

  • Good Quality
  • Easy to Use
  • Sturdy Construction
  • Auto Ranging
  • Affordable
  • Measure Capacitance, Temperature, Frequency, Voltage and Current
  • Safe to Use

Cons

  • No True RMS so accuracy level is low
  • Case does not included in package

Klein Tools MM600 Multimeter Pros Vs. Cons:

Read Customer Reviews Here >>

Pros

  • Easy to Use
  • Easy to Use
  • Measures Temperature, Capacitance, Current, Voltage & others
  • Backlit Display
  • Strong Construction.
  • Auto Hold & Auto Ranging
  • Auto Power Off

Cons

  • Doesn’t have true RMS.
  • Continuity measurement is slow.

FAQs:

Q1. Which multimeter is better Comparing Klein Tools MM400 VS MM600  and why?

Both multimeters are available at an affordable price and embedded with the basic features. However, there are some lacking in both. Klein Tools MM600 wins the race when it comes to safety from falls.

Klein Tools MM400 has a separate battery compartment while mm600 does not have it but you can easily access the battery. MM600 has a low battery indicator and a fuse replacement compartment. In terms of safety, mm600 is leading.

And mm600 launched in the market after mm400 with some improvements. So if you are planning to get a device that can help you to perform tasks at an affordable rate then go for MM600.

Q2. Do these multimeters provide accurate measurements?

Unfortunately, both devices Klein Tools MM400 & MM600 lack a true RMS feature. But these devices managed to provide accurate measurements up to a certain extent. However, professional electricians appreciate the accuracy and precision of mm400.

Similarly, the mm600 is the auto-ranging multimeter that delivers accurate measurements as well. Either way, both are good on their level.

Q3. How to find when to change the battery?

Luckily both multimeters come with a low battery indicator that helps the user to find the battery issues on the go. Through the low battery indicator, you will get the notification when the battery gets low and then replace the batteries easily through the compartment.

Q4. Which multimeter is safer?

Klein Tools MM400 Digital Multimeter comes with the certification of CAT III 600V while MM600 has CAT III 1000V & CAT IV 600V safety ratings. This clearly shows that the MM600 is safer than the MM400. However, both come with enough protection to save the user from any damage.

Q5. Which multimeter can take higher measurements?

Both multimeters can take the measurements up to a certain limit. But in comparison of both, Klein Tools MM600 HVAC Multimeter is on top because with this multimeter you can measure the high voltage, current, capacitance, resistance, and frequency.

In terms of buying, it depends on the user whether they need to take the high measurements or moderate one and then choose accordingly. However, due to the low price, it is strictly prohibited to take the higher measurements with these devices.

Conclusion:

In this article, we have provided a detailed comparison Klein Tools MM400 Vs MM600 Multimeter Review. MM400 is best for those who need to perform the standard electrical works daily. By that, we mean those who do not require high accuracy, speed or to measure the higher readings. While MM600 is good for the electricians who required a backup multimeter to perform the tasks or those who need to deal with comparatively high readings for tasks around the home, office, schools, and others.

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George Crook

George Crook is a machinery enthusiast and has vast experience in dealing with different types of tools and machinery. He has a bachelor's degree in Electrical Engineering.

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