Klein Tools MM400 Multimeter, Digital Auto Ranging, AC/DC Voltage, Current, Capacitance, Frequency, Duty-Cycle, Diode, Continuity, Temp 600V
Condition: New
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Availability:
Only 8 left in stock, order soon!
Arrives
Wednesday, Nov 11
At a glance
- Condition
- New
- Style
- Multimeter
- Model
- MM400
- Dimensions
- 1.78 x 3.07 x 6 in
- Weight
- 8.2 oz
- Color
- Orange
- Power Source
- Battery Powered
- In the box
- Test LeadsBatteriesThermocoupleand User Manual
- Warranty
- 1 year manufacturer
Features 7
- Multimeter measures up to 600V AC/DC voltage, 10A AC/DC current and 40 MOhms resistance
- Electrical tester measures temperature, capacitance, frequency, duty-cycle, and test diodes and continuity
- CAT III 600V safety rating
- Built to withstand a 3.3-foot (1 m) drop and withstand daily wear and tear on the job site
- Low battery indicator and easily accessible battery compartment
- For use in basic and controlled electromagnetic environments such as residential, business and light-industrial locations
- Includes test leads, thermocouple with adapter, batteries and user manual
Description
Proudly made for professionals, the 5/32-Inch Journeyman Hex T-Handle from Klein Tools delivers more torque to the fasteners than standard hex keys. Klein hex-keys are the tools professionals cannot afford to be without. Heat- treated and tempered for superior strength and durability, Klein hex-keys are designed for a precise fit in sockets, preventing slippage and stripping of the socket. For more than 160 years, Klein Tools has manufactured premium- quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.
Specs 19
| Brand | KLEIN TOOLS |
|---|---|
| Power Source | Battery Powered |
| Style | Standard |
| Color | Orange |
| Item Weight | 8.2 ounces |
| Measurement Type | Multimeter |
| Maximum Operating Voltage | 600 volts |
| Style Name | Standard |
| Item Dimensions | 1.78 x 3.07 x 6 inches |
| Specification Met | Electromagnetic |
| Brand Name | KLEIN TOOLS |
| Model | MM400 |
| Unit Count | 1 Count |
| UPC | 092644690211 |
| Number of Items | 1 |
| Manufacturer | Klein Tools |
| Global Trade Identification Number | 11 |
| Item Type Name | Klein Tools MM400 Multimeter, Digital Auto Ranging, AC/DC Voltage, Current, Capacitance, Frequency, Duty-Cycle, Diode, Continuity, Temp 600V |
| Part Number | MM400 |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Nov 11
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Solid, cheap, orange, and fantastic!
I have been using this little orange electron wrangler for a few months now and I have a few preliminary opinions formed. First off, this thing is pretty cheap, and I would not recommend it for a professional as a primary meter (obviously), or even the serious DIY'er. Mainly, it lacks range, overall accuracy, and true RMS functionality. However, for the home-gamer, or as a cheap backup to your Fluke, this little guy is pretty great. The good: The readout is clear and crisp, and the backlight works wonderfully. The lead wires are supple, and the ends do fit into household outlets once you remove the plastic CAT IV covers (duh). The included K-type thermocouple has a long (over 12-inch) reach, and it agrees to within 1 degree Fahrenheit with my other instrumentation up to about 400 degrees. The continuity test is pretty decent, and it has a light and a beeper, which is great in environments where hearing protection is required. The rubber case that surrounds most of the unit is grippy and seems fairly durable. It says the meter can be dropped up to a meter, which could get confusing, but I think I'll go with the metric interpretation in this case. The stand is pretty awesome as well; it pops out of the back and has rubber feet that effectively hold the meter in a good viewing position on most semi-level surfaces. Lastly, this meter is pretty feature-packed, having all the standard gizmos in addition to AC/DC current, frequency, duty cycle, thermocouple temperature, capacitance, and diode testing. It can do quite a bit, even if it can't do it as well as a $200 meter. Safety: This meter features two slow-blow ceramic fuses, which are the industry standard for safety, and will protect you from shrapnel should you accidentally touch the leads to a 1.21-gigawatt power source in continuity mode. Caveats: The HOLD function on this meter is a joke; you put the leads on the circuit, press the HOLD button, and the instantaneous reading is frozen in the display for you to read. Contrast this to Fluke's feature where you push the HOLD button and then hook up the leads and the meter gives you a beep and holds your number on the display once the readings stabilize. Maybe Fluke has a pending patent on this technology - it would be interesting to find out why other companies aren't doing something similar. Still, is this function worth the extra $150+ to someone who isn't a professional? Probably not. Next, the continuity/low resistance tester has a small amount of lag in it. That is, you must create a complete circuit for more than about half a second for the unit to beep, indicating low resistance. This may not be an issue for you, but if you find yourself dragging a lead across a set of pins trying to trace a short, you'll quickly find the lag in the continuity indicator to be a bit of, well, a drag. Still, some of the higher-end meters also have this issue, so it definitely isn't a damnable offense for this little guy to be lacking in this area as well. But, it is something you ought to consider before making your purchase. Overall: This is a decent little meter that can do 90 percent of the things a DIY'er will ask of it.
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Reviewed in the United States on January 21, 2017 by The Crafty Consumer
Outstanding Quality and Performance – Klein Tools Delivers Again
Klein Tools has always set the standard for professional-grade tools, and this multimeter is no exception. From the moment you pick it up, the build quality speaks volumes — rugged, solid, and clearly designed for real-world job site demands. Accuracy is spot on, whether you're measuring voltage, current, resistance, or continuity. The readings are consistent and fast, with virtually no lag, which makes troubleshooting efficient and reliable. The auto-ranging feature works flawlessly and saves time in the field. Durability is another standout. This meter is clearly built to last, with a reinforced casing that can handle drops and daily wear. The display is sharp and easy to read, even in dim lighting, and the controls are intuitively laid out for one-handed use. Packed with features like true RMS, backlit display, and a wide measurement range, it’s everything a professional or serious DIYer needs — without the unnecessary fluff. Klein Tools continues to prove they understand what technicians actually use and value. In short, this meter nails it: fast, accurate, durable, and thoughtfully engineered. If you want a meter you can count on day in and day out, this is it.
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Reviewed in the United States on June 6, 2025 by GLouis
Solid construction, nice features, great price value.
Bought the MM400 to replace my aging Beckman Circuitmate DM27 which I was using for general home use. I'm really happy with the Klein MM400, it's small and easy to handle, has nice quality probes and feels solid. The simple dial and auto range feature makes it easy to use and the on demand back-light and auto-shutoff to save battery are features I was looking for in a new DVM. The one inconvenience is that the unit defaults to AC for and voltage and current measurements. This makes sense as the unit is intended for electricians who most often deal with AC installations. Most my usage is for DC measurements so I have to remember to press the SEL button to change it, no biggie, I'll survive. I compared accuracy for measurements of voltage, current, capacitance and frequency between the Klein and my older Beckman and the readings were consistent with in a few tenths of a percent between the two. I couldn't verify the resistance accuracy as that's the feature that failed on my old Beckman. I wouldn't choose this basic unit for precise computer or circuitry troubleshooting but for electrician work, auto repair, or even typical home hobby electronics it would be fine.
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Reviewed in the United States on March 22, 2018 by Bob
Great multimeter, but DC / electronics techs be aware!
Overall, it does what I need, seems accurate and well-designed, has a nice backlight, and I know Klein is a great brand. What I wish I'd known before I bought a Klein multimeter is that it defaults to AC in all current and voltage modes, and requires a press of the SEL button to toggle to DC. And even when switching between mA and µA, for example, it returns to AC. There's no way to change this default. As someone who works exclusively with small DC electronics, this is a noteworthy inconvenience. The number of times I've been flabbergasted by my reading, only to realize I didn't switch to DC yet again... has me wondering if I should have chosen a different brand.
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Reviewed in the United States on May 14, 2022 by Philip Finch
Reasonable price for a great tool.
Sure, the MM400 is not a Fluke .... but then, how many of us really need a Fluke? For the average home gamer, we need a meter than can reliably answer three questions: (a) is this battery dead?, (b) is this outlet live? and (c) does this switch work? The MM400 answers these questions and plenty more, making this auto-ranging meter an excellent value. And face it, when you walk through the electrical department of the Big Orange Home Center, Klein Tools is not the cheap stuff. There's something to be said in a reputation for quality. Pros: Auto-ranging. Nice leads. Backlight. Included K-type thermocouple with adapter. Built to survive a 1-meter drop. Soft(ish) plastic/rubber housing for durability. Compact size, fits perfectly in my (hopefully normal sized) grip. Accuracy that rivals/exceeds the more expensive old-school Craftsman it is replacing. And the nice feeling that comes when purchasing something with no regrets. Cons: I'm kinda drawing a blank here. Basically, if you're the kind of person that has an oscilloscope and pre-heated soldering iron on your workbench, you might want more. For the rest of us, the MM400 is all we really need.
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Reviewed in the United States on April 10, 2017 by GSinBaltimore
⭐5 Stars⭐ │ESSENTIAL│ AUTO-RANGING │ Comprehensive Functions │ Bright Display │ Durable
DIYer ESSENTIAL. There are a LOT of bits and should cover almost all DIYer situations. No issues except the bits come loose from their friction fit slot. PROS ✅ Klein = Awesome ✅ Comprehensive - AC/DC voltage, AC/DC current, resistance, frequency, temperature ✅ Durable - rugged, drop-resistant housing. Meets specific safety standards also. ✅ Display - bright backlight CONS None! TIPS 💡 Storage - it’s a piece of sensitive equipment. Store and treat it with care. 💡 Multimeters can seem scary to a DIYer - watch some youtube videos!
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Reviewed in the United States on March 25, 2025 by Diiiiirk & Coopie
Great product
I was looking for a multimeter that is accurate and easy to use around the house for a person who is not a professional electrician. This product meets all of my needs, especially when used in conjunction with “how to” videos from the internet. I especially like how the controls are laid out and that the screen is bright and easy to read. I haven’t used the thermocouple yet but it seems to read the ambient air temperature accurately and is a nice add on, even though it is not a high-demand item for me. This multimeter is a terrific value that puts you way ahead of the lower-end units. I highly recommend it!
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Reviewed in the United States on October 8, 2021 by Thomas De Jonge
Good for Tool KIt
Worked well for me, liked it enough to by an upgraded model for dedicated use at another location.
Reviewed in the United States on March 5, 2026 by Mountain Man