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🛠️ Power Your Precision, Own the Jobsite
The Klein Tools MM325 is a professional-grade digital manual-ranging multimeter designed for electricians and serious DIYers. It measures AC/DC voltage up to 600V, DC current up to 10A, and resistance up to 2MΩ, with additional functions for battery, diode, and continuity testing. Featuring lead-alert LEDs for safety, a backlit display for visibility, and rugged construction tested to withstand 6.6-foot drops, this tool combines precision, durability, and convenience. Complete with test leads, safety caps, and batteries, the MM325 is built to deliver reliable performance in residential, commercial, and light industrial environments.












| ASIN | B0B57L9FNL |
| Best Sellers Rank | 83,225 in DIY & Tools ( See Top 100 in DIY & Tools ) 143 in Multi Testers |
| Brand | KLEIN TOOLS |
| Colour | Orange/ Black |
| Country Of Origin | Afghanistan |
| Customer Reviews | 4.7 out of 5 stars 2,645 Reviews |
| Global Trade Identification Number | 00092644693731 |
| Included Components | Multimeter, Voltage Tester |
| Item Dimensions | 23.7 x 12.9 x 9.7 centimetres |
| Item Length | 6.41 Inches |
| Item Type Name | Building Material |
| Item Weight | 0.87 Pounds |
| Item Width | 3.13 Inches |
| Item dimensions L x W x H | 23.7 x 12.9 x 9.7 centimetres |
| Item weight | 0.87 Pounds |
| Manufacturer | Klein Tools |
| Manufacturer Part Number | MM325 |
| Maximum Operating Voltage | 600 Volts |
| Measurement Type | Multimeter |
| Minimum Operating Voltage | 9 Volts |
| Model Number | MM325 |
| Power Source | Battery Powered |
| Power source | Battery Powered |
| Specification Met | Cat Iii 600v Safety Rating |
| Style | Protection,Safety |
| Style Name | Protection,Safety |
| UPC | 092644693731 |
| Unit Count | 1.0 count |
| Upper Temperature Rating | 60 Degrees Celsius |
A**F
First class
Excellent meter, great price too!
D**.
For a few pounds more than a battery tester I have a reliable multimeter
I needed a good battery tester, having experienced that the usual cheap ones were not very reliable. I decided that I may as well invest in a multimeter that could test batteries. I'm very pleased with this - exceptional quality for the price (YouTube reviews attest to build quality) - and it will test 1.5V / 9V batteries 'under load' to give an accurate remaining voltage reading. You have to use the supplied leads to 'touch' the battery +/-contacts so perhaps not as convenient as many specific battery testers, but this multimeter does have a built-in stand which means you have both hands free.
A**R
good price
works as it should hopefully will last
M**.
Perfect for all my jobs
This is the second multimeter I have purchased. I wanted to test an earthing sheet and the one purchased from Halfords wouldn’t test low enough. This one did the job as much more accurate and a much sturdier feeling device. It has since proved itself again with vehicle fuse checking saving me garage costs. Would thoroughly recommend.
A**A
Amazing Multimeter for the Price
Klein Tools MM325 Multimeter, Digital Manual-Ranging 600V AC/DC Voltage Tester: Love my new Klein multi-meter, very accurate readings, nice clear screen, 'normal' batteries, and the leads are good quality. I bought an off-brand hard fabric case for it to keep the leads in good nick. Lovely multi-meter, and just as good as the bigger more-expensive "F" brand units.
P**M
Great
Good quality.
V**W
Good multimeter
As described
G**N
A quality product
A well designed quality product with clear, simple controls.
D**S
Great Quality and Accurate
Great quality multimeter for anything you could need for around the house, garage, shed, workstation, and electronics.
B**B
Just right for a DIYer
I had a cheap multimeter before that basically fell apart. This Klein model seems to be well made and has all functions that I will use. The digital display is easy to read and the automatic shutoff works as advertised - already tested that feature - 🙄. For what I will be doing with this unit, I’m glad I purchased this one.
S**V
Fast service
Doing its job. Good quality.
M**E
OK
Conforme
S**N
Great Quality Multimeter for the Price
I’ve been using the Klein Tools MM325 Multimeter for a while now, and I’m really impressed with how well it performs for both DIY and professional use. The build quality is solid—typical of Klein Tools—and it feels durable enough to handle daily use in a toolbox or on a job site. The display is clear and easy to read, even in lower light. The auto-ranging feature works accurately and saves a lot of time when switching between different measurements. It handles voltage, continuity, and resistance testing reliably, and the leads are sturdy with good flexibility. One of my favorite features is the backlight and data hold function—it’s a small thing, but it makes a big difference when working in tight or dark spaces. The battery life has been great so far, and the protective rubber case gives it a rugged feel that inspires confidence. If you need a dependable, mid-range multimeter without spending a fortune, the MM325 is a fantastic choice. Klein’s attention to detail really shows here. Pros: Sturdy and well-built Accurate readings Clear backlit display Great value for the price Cons: Doesn’t measure milliamps or microamps (not a dealbreaker for most) Slightly bulky for small tool pouches Verdict: Highly recommended for electricians, HVAC techs, or DIYers who want reliability and ease of use without going for high-end professional meters.
Trustpilot
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