Fluke 101 vs Klein MM400 – Choosing the Right Multimeter


As an electrical engineer from Stanford University with over 7 years of experience using multimeters.

No doubt about it, Klein and Fluke are big names in the multimeter game. These brands have built a solid reputation for their trustworthy and long-lasting designs. 

Some folks get a bit confused between Fluke 101 vs Klein MM400, their most affordable offerings. While both deliver reliable performance, they do have some distinct differences that set them apart. 

Now, let’s get one thing straight right off the bat. Fluke multimeters are the go-to choice for heavy-duty industrial use, while Klein multimeters shine when it comes to simple home testing and measurements.

So, let’s roll up our sleeves and take a closer look at each multimeter’s unique capabilities.

Fluke 101 vs Klein MM400 – Which One to Consider?

Let’s cut to the chase. When it comes to the Fluke 101 versus the Klein MM400, it all boils down to your specific needs. 

Here’s the deal: the Fluke 101 is known for its rock-solid durability and impressive accuracy. This multimeter is likely your best bet if you’re tackling heavy-duty industrial work. It’s built to handle the toughest conditions and deliver precise readings you can rely on.

Now, if you’re just looking for a no-frills multimeter for basic home testing and measurements, the Klein MM400 steps up to the plate. It’s designed for general use around the house and gets the job done without breaking the bank.

To make the right decision, consider a few key factors. If accuracy and reliability are non-negotiable for your specific tasks, then Fluke 101 is the way to go.

However, if you’re keeping an eye on your wallet, Klein MM400 offers attractive price points for their models. They provide a great option for budget-conscious shoppers who still want a decent multimeter in their toolkit.

Fluke 101 vs Klein MM400  – Specifications

FeatureFluke 101Klein MM400
Display6000-count LCD4000-count LCD
True RMSNoNo
Voltage Range0.1mV – 600V0.1mV – 600V
Resistance Range0.1Ω – 40MΩ0.1Ω – 40MΩ
Capacitance Range1000μF1nF – 200μF
Frequency Range50 Hz – 100 kHz1Hz – 50 KHz
Duty CycleYesYes
Temperature Range0 °C to +40 °C-18° – 538°C
Diode TestYesYes
Continuity TestYesYes
Low Battery IndicationYesYes
Safety RatingsCAT III 600VCAT III 600V
Drop Protection3.3 ft (1m)3.3 ft (1m)
Auto ShutoffYesYes

Fluke 101 – Quick Rundown


  • Basic dc accuracy 0.5%
  • CAT III 600 V safety rated
  • Diode & Continuity test (buzzer)
  • Small, lightweight design for one-handed use
  • Rugged, durable design
  • Easy Battery Replacement
  • Automatic Shutdown

Alright, let’s zoom in on the Fluke 101 and see what makes it tick! One major reason for Fluke Corporation’s sky-high success is their unwavering commitment to quality and customer satisfaction. 

The Fluke 101 may be considered a basic pocket DMM, but don’t let that fool you. It’s perfect for those standard measurements we encounter on the regular: voltage, resistance, and continuity. It even throws in the bonus ability to measure capacitance and frequency. However, it’s worth noting that there are no amps or milliamps ranges, so HVAC technicians might need something with a bit more oomph.

Now, let’s talk size. The Fluke 101 is a pint-sized powerhouse, about half the size of Klein MM400. About the size and weight of a large smartphone. 

There’s no backlight on this tester, which can be a bit of a bummer in dimly lit situations. 

Typically, you’ll find continuity and diode check on the resistance (Ω) range, and duty cycle snuggled up with the frequency (Hz) range. 

When it comes to accuracy, the Fluke 101 doesn’t disappoint. It’s a reliable companion for tradesmen and amateurs alike, delivering accurate measurements across most ranges and handling those sneaky transient spikes that can trip up other multimeters. Sure, there’s no backlight on display, and the response time isn’t the flashiest, but you can’t have it all for just 50 bucks!

The package for the Fluke 101 includes:

  • Fluke 101 Multimeter
  • TL75 test leads
  • Two AAA batteries


  • Small and lightweight design
  • Excellent build quality
  • Ideal for industrial use
  • Reliable and accurate measurements
  • Wide range of tests supported
  • Separate voltage input ranges
  • Affordable price point


  • Display lacks backlight
  • Auto ranging can be slightly slow

Klein MM400  – Quick Rundown


  • Measures up to 600V AC/DC voltage
  • Electrical tester: temperature, capacitance, frequency, duty-cycle
  • CAT III 600V safety rating
  • Withstands a 3.3-foot (1 m) drop
  • Low battery indicator
  • Suitable for light-industrial locations

Read Klein MM400 Review

Now, let’s shift our focus to the Klein MM400 and uncover what makes it stand out from the crowd.

Alright, let’s jump into the world of the Klein MM400, a multimeter designed by electricians for electricians. This meter knows its stuff and boasts a logical and user-friendly interface, ensuring a hassle-free experience that’ll make your electrical projects a breeze. 

Now, the MM400 may not have all the bells and whistles, but it sure knows how to deliver solid performance where it counts. With its versatile range of test criteria, including capacitance and temperature measurements, this meter proves to be a reliable companion across various fields. While the capacitance range may not soar to the skies, capping at 200µF, the MM400 makes up for it with impressive voltage and current capabilities. Expect accurate readings and a job well done in these areas.

Now, let’s talk about the display. It may not be the flashiest in town, but it gets the job done. The MM400 offers a count of up to 4000, providing you with clear readings, this meter comes with a nifty backlight feature to save the day. 

The Klein MM400 displays readings in both Fahrenheit and Celsius, the MM400 may have slightly restricted capacitance and frequency ranges, but overall, it’s a solid performer. It offers test ranges that you won’t always find in other multimeters within its price range, making it a reliable choice for various applications. Just keep in mind that a carry case isn’t included, but you can grab one separately for a minimal cost.

Now, I won’t pretend that the MM400 can match the robustness of its higher-tier counterparts like the MM600 or MM700, but for its price point, it offers great value. Checking power in socket outlets, switches, batteries, and more? Consider it done! Electricians and DIY enthusiasts alike trust the MM400 to get the job done right.

So there you have it, folks – the Klein MM400, your reliable electrician’s sidekick. With its user-friendly interface, solid performance, and versatility, this meter is ready to tackle your electrical adventures head-on.

The package for the Klein MM400 includes:

  • Klein MM400 multimeter
  • AAA batteries (x2)
  • Leads
  • Thermocouple
  • User manual


  • Quality brand known for reliability
  • Compact and user-friendly design
  • Clear display with backlight
  • Auto-ranging and micro-amps feature
  • Comes with a thermocouple


  • Not True RMS
  • Not ideal for industrial use

What Users Say About Fluke 101 vs Klein MM400

Let’s hear what users have to say about the Fluke 101 and the Klein MM400.

Regarding the Fluke 101, one user who rebuilds old vacuum tube volt meters raves about its performance. They regularly use it to calibrate and troubleshoot circuits in 50-60-year-old technology. After almost a year of consistent use, they haven’t had to change the batteries yet. The auto shut-off feature gives them peace of mind. Right out of the box, the resistance and voltage measurements were spot on. The only downside they mention is the lack of a kickstand, likely due to the leads coming out the bottom. However, they found a .stl file to 3D print a plastic base if needed. They also suggest that a rubber over-molded sleeve would be a nice aftermarket addition, in case the multimeter gets dropped.

On the other hand, let’s dive into a user’s experience with the Klein MM400. Initially, they had a negative encounter, but the way Klein Tools handled it turned their experience around. They reached out to Klein Tools through Amazon Customer Service, and Klein Tools promptly resolved the issue. Not only did they refund the full amount, but they also told the user to keep the product! The user greatly appreciated this excellent service and upgraded their rating from 1 star to a glowing 5-star review. However, they also noted some dissatisfaction with the packaging, which seemed to indicate it was a used or returned item. Additionally, the test leads were missing, which was a crucial part of the product. They expressed frustration but couldn’t recall if they had chosen the “Used – Good Condition” or “NEW” option when purchasing. Overall, they were looking forward to the product but were disappointed with its initial condition.

These real-life experiences give us insights into the Fluke 101 and the Klein MM400. Remember, individual experiences may vary, so it’s important to consider multiple perspectives before making your decision.

Final Verdict – Fluke 101 vs Klein MM400

After exploring the features, customer reviews, and overall performance of the Fluke 101 and the Klein MM400, it’s time to reach a final verdict.

When it comes to overall superiority, Fluke 101 emerges as the winner. Its reliability, accuracy, and the added bonus of a lifetime warranty make it a top choice for professionals and enthusiasts alike. The trustworthiness of the Fluke brand, coupled with its precise measurements, sets it apart from the competition.

However, let’s not dismiss the Klein MM400 just yet. While it may not have all the bells and whistles of the Fluke 101, its compact size, ease of use, and dependable performance make it a worthy contender. For those seeking a straightforward multimeter that gets the job done without any fuss, the MM400 proves to be a reliable companion.

In the end, the final verdict leans in favor of Fluke 101.

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