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Extended holiday returns
FREE refund/replacement until Jan 31, 2027 Learn more
FREE refund/replacement until Jan 31, 2027 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Monday, Nov 16
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At a glance
- Condition
- New
- Size
- Manual-Ranging
- Model
- MM325
- Dimensions
- 9.33 x 5.08 x 3.82 in
- Weight
- 13.92 oz
- Color
- Orange/ Black
- Power Source
- Battery Powered
- In the box
- MultimeterVoltage Tester
- Warranty
- See Manufacturer Website
- Works with
- Electrical components and circuits
Features 5
- VERSATILE FUNCTIONALITY: Measures AC/DC voltage up to 600V, 10A DC current, 2M resistance; additional features include continuity, diode test and battery test
- LEAD-ALERT PROTECTION: LEDs on the meter illuminate to indicate proper test lead placement, enhancing accuracy and safety during measurements
- BACKLIT DISPLAY: LCD shows clear readings in low-light conditions for enhanced visibility
- BATTERY TEST: Battery test mode can be used for checking if batteries are working
- CONVENIENT FEATURES: Test lead holders on the back of the meter, kickstand and optional magnetic hanger (Cat. Nos. 69445 or 69417) for hands-free operation
Description
Klein Tools MM325 Multimeter is a manual-ranging multimeter that measures AC/DC voltage, DC current, and resistance. It can also test batteries, diodes, and continuity. Klein Tools' Test and Measurement product line was exclusively designed from the ground up by electricians for electricians. Years of field research, combined with extensive input from electricians across America, inspired the development of meters and electrical testers loaded with innovative, time-saving features. 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 23
| Brand | KLEIN TOOLS |
|---|---|
| Power Source | Battery Powered |
| Style | Manual-Ranging |
| Color | Orange/ Black |
| Item Weight | 13.92 ounces |
| Minimum Operating Voltage | 9 volts |
| Upper Temperature Rating | 60 °C |
| Measurement Type | Multimeter |
| Maximum Operating Voltage | 600 volts |
| Style Name | Manual-Ranging |
| Item Dimensions | 9.33 x 5.08 x 3.82 inches |
| Specification Met | Cat III 600v Safety Rating |
| Brand Name | KLEIN TOOLS |
| Model | MM325 |
| Unit Count | 1 Count |
| UPC | 092644693731 |
| Number of Items | 1 |
| Item Highlight | 600V AC/DC Voltage Tester, Tests Batteries, Current, Resistance, Diodes, and Continuity |
| Manufacturer | Klein Tools |
| Number of Packs | 1 |
| Global Trade Identification Number | 31 |
| Item Type Name | Building Material |
| Part Number | MM325 |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Nov 16
Yes, absolutely! This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027.
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
Great Multimeter — Excellent Value for the Money
Size: Manual-Ranging
Great Multimeter — Excellent Value for the Money I bought the Klein Tools MM325 Multimeter after researching different meters, and it has turned out to be a great purchase. I paid around $29, and for that price it offers a lot of useful features and the quality you expect from Klein Tools. It measures AC/DC voltage, current, resistance, continuity, and batteries, which makes it useful for a wide variety of jobs around the house, garage, and workshop. It handles up to 600V AC/DC, feels durable and well made, and comes with a 5-year warranty. One of the main reasons I bought it was to troubleshoot my 18V power-tool batteries and chargers. It worked perfectly for that and gave me clear, consistent readings that helped determine whether a battery was charged, deeply discharged, or simply bad. I’ve also found the continuity and electrical testing features very handy for other DIY projects. It is manual-ranging, but I found it straightforward to learn and use even though I’m not a professional electrician. For a homeowner or DIYer who wants a dependable meter without spending a lot of money, the MM325 has more capability than I’ll probably ever need. Accurate, versatile, durable, easy to use, and a great value. I’m very happy with my purchase. Five stars!
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Reviewed in the United States on September 29, 2026 by Rocky Decker
Pro-grade reliability for any home garage
Size: Manual-Ranging
After looking at several options I went with the Klein MM325 because I needed a rugged manual multimeter. This tool is built for household DIY and automotive jobs where you need real reliability without spending a fortune. I think it deserves five stars because it simplifies safety while providing a very sturdy entry point for beginners. It feels heavy in the hand which gives me more confidence than using some cheap discount store brand. The standout feature is definitely the Lead Alert which uses bright LEDs to show where to plug in probes. This effectively stops you from blowing a fuse because it forces you to look at the jacks first. It has survived a couple of drops on my garage floor thanks to the thick casing and backlight. The accuracy is impressive for the price and the DC voltage readings have stayed consistently within the manufacturer specs. Just keep in mind that manual-ranging means you have to select the voltage settings yourself instead of it being automatic. I did see some minor millivolt ghosting when the leads were floating but the instructions explain that is normal. This is the ideal multimeter for any homeowner who wants a safer and more durable tool than unrated junk. I highly recommend buying this if you want a guided experience that helps you avoid making expensive electrical mistakes.
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Reviewed in the United States on May 14, 2026 by M Osekou
Excellent Meter.
Size: Manual-Ranging
I love this meter. I use it everyday in my work as a technician. It hasn't failed me yet. It's easy to use and seems to be accurate. It replaced my $300 fluke which bit the dust after so many years of excellent service. This Klein works just as good. It is a little bit smaller than my Fluke was and therefore fits better into my tool pouch pocket. The case is very durable and the screen lights up well. It is a very good value for the money.
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Reviewed in the United States on February 28, 2026 by Amazon Customer
Klein makes good tools.
Size: Manual-Ranging
Great multimeter for the price. I bought a cheaper multimeter and has serious problems. I put it into an outlet and sparks flew everywhere!! Then I bought this one and zero issues. I have used it a few times and it works great. Dont mess around with the cheaper brands this meter is perfect.
Reviewed in the United States on August 1, 2026 by Todd W.
Perfect for around the house and shop.
Size: Manual-Ranging
Product is as described. Comes well packaged. Just be careful cutting though the plastic enclosure, is fairly thick and can cut you. Comes with the negative and positive leads that are of a good length of 3’ each. Has a good operation and maintenance instruction booklet. Is made of quality material and should last a long time if taken care of. I’m happy with my purchase. For around the house not working on very high voltage, this will be perfect for me.
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Reviewed in the United States on September 15, 2026 by Scott N.
Simple to use and works well
Size: Manual-Ranging
Nice multimeter for general electrical work.
Reviewed in the United States on October 10, 2026 by Purchaser
Wouldn't go any other way
Size: Manual-Ranging
Great all around multimeter. Exactly what I needed it for. Fantastic buy for what you get
Reviewed in the United States on September 13, 2026 by Richard Dickson
Great Quality Multimeter for the Price
Size: Manual-Ranging
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.
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Reviewed in the United States on October 9, 2025 by Scott j. Elphison