

⚙️ Master your measurements with Klein’s MM420 — where precision meets power!
The Klein Tools MM420 is a professional-grade auto-ranging TRMS digital multimeter designed for accurate measurement of up to 600V AC/DC voltage, 10A AC/DC current, and 50 MΩ resistance. Featuring advanced safety Lead-Alert LEDs, a backlit display for low-light conditions, and durable construction that withstands 2-meter drops, it’s engineered for demanding residential, commercial, and light industrial environments. This versatile tool also measures temperature, capacitance, frequency, and more, making it an essential companion for millennial managers who demand precision and reliability on every project.












| ASIN | B0B57PFFYX |
| Best Sellers Rank | 156,036 in DIY & Tools ( See Top 100 in DIY & Tools ) 333 in Multi Testers |
| Brand | KLEIN TOOLS |
| Colour | Orange/Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (817) |
| Global Trade Identification Number | 00092644693748 |
| Included Components | Digital Multimeter, TRMS Auto-Ranging, 600V, Temp |
| Item Dimensions | 23.7 x 12.9 x 9.7 centimetres |
| Item Type Name | Digital Multimeter, TRMS Auto-Ranging, 600V, Temp |
| Manufacturer | Klein Tools |
| Measurement Type | Multimeter |
| Minimum Operating Voltage | 9 Volts |
| Model Number | MM420 |
| Power Source | Battery Powered |
| Specification Met | Cat Iii 600v Safety Rating |
| Style Name | w/Lead Alert |
| UPC | 092644693748 |
| Unit Count | 1.0 count |
| Upper Temperature Rating | 1000 Degrees Celsius |
V**1
Does not come with carry case
Multimeter is good and so are its functions. However it does not come with a carry case as stated. False advertising
H**V
Inadequate
Bought for my husband. But not impressed. He found inadequate.
M**E
Review
Does exactly what I bought it for
D**J
Rewelacyjny multimetr,polecam również dla początkujących.
C**N
Buen producto y fácil de usar.
G**S
I've been a fan of Klein Tools for years, so considering a Klein multimeter wasn't difficult at all. I've used mostly Fluke multimeters in my 40+ year carreer as a technician. They are considered the best of the best. With that accuracy, repeatability, and quality, you pay dearly! So I was looking for a second lower-cost meter. I was also looking for a reverse backlit display--white numerals on a black background. I'd looked at Milwaukee, but they do not include a diode check function. I chose the MM450 for it's features and price point. While I have not compared accuracy to other meters, published specs are similar to other more expensive meters. There is one minor issue in my review, and that is the white-on-black display needs to be viewed pretty much head-on for best quality. Depending on the tilt angle, there are positions where the display is very faded, almost to disappear. That might be an issue if you measuring in tight quarters or not able to look straight on otherwise. It comes with test and temperature probes, and fabric case. An optional rare-earth magnetic hanging strap is available. Besides voltage and current, it also measures resistance, capacitance and frequency, along with a peak hold function, making it an ideal meter for most service techs. One other minor detail...when in Auto scale mode, it can take up to 5 seconds for the reading to finally resolve. If you are troubleshooting something point to point and in a hurry, this may be an annoyance. However, if you turn off the Auto-scale mode, the readings display quite a bit faster. Given the display issue (and that might not be a problem for everyone) I'd give it a 4.5, if that were possible. But it's certainly better than a 4, so a 5 it is!
Z**H
I’ve been using the Klein Tools MM420 Digital Multimeter for a bit now, and I’m honestly impressed with how solid and reliable it is. First thing I noticed is the build quality. Like most Klein Tools products, it feels durable and well-made, not like one of those cheap meters that feels like it’ll fall apart if you look at it wrong. The buttons and dial have a good, firm feel, and everything is clearly labeled. The auto-ranging feature is a huge plus. It makes taking measurements quick and simple without having to constantly adjust settings. The readings are fast and consistent, and the True RMS capability gives me confidence that I’m getting accurate results, especially when working with AC circuits. I’ve used it for checking voltage, current, and resistance, and it handles everything without any issues. The display is easy to read, even in less-than-ideal lighting, and the overall layout is intuitive. For the price, this is a great value. It’s reliable, easy to use, and built to last. Whether you’re doing basic troubleshooting or more involved electrical work, this meter gets the job done without any hassle. Definitely one of those tools you buy once and don’t have to think about replacing anytime soon.
C**N
Comme sur l’annonce, perfect
Trustpilot
Hace 1 mes
Hace 2 semanas