AstroAI
AstroAI AM33D Digital Multimeter
8.4 / 10
The inexpensive first meter that covers every check a kit builder needs.
Check Price →
Read full review →
We earn a commission, at no extra cost to you.
Multimeters Most Rugged Budget Meter
Klein Tools MM325 Manual-Ranging Multimeter Review
Reviewed by Kerem Başbuğ · Last updated September 28, 2026 · How we rank
8.5 / 10 · our score
A manual-ranging meter from a brand electricians already trust, measuring AC/DC voltage to 600V, current, resistance, diodes, continuity and batteries. It is built to be dropped in a toolbox, not just to sit on a desk.
Quick Specs
- Brand
- Klein Tools
- Category
- Multimeters
- Price tier
- Budget ($)
- Our score
- 8.5 / 10
- Best for
- People who want one sturdy meter for electronics and occasional household electrical checks.
Our verdict
The MM325 is the meter for people whose multimeter lives in a toolbox rather than a drawer. Manual ranging is old-fashioned but predictable, the battery test is genuinely handy, and Klein builds for trade abuse. If you only do bench electronics, the auto-ranging AstroAI gives you more for the money; if the meter will travel, this is the tougher choice.
Pros & cons
Pros
- Trusted trade brand with a robust build
- Measures to 600V AC/DC
- Dedicated battery test function
- Simple, predictable manual ranging
Cons
- Manual ranging means choosing the range yourself
- No capacitance or temperature modes
Check Price on Amazon →
We earn a commission, at no extra cost to you.
Key features
- Manual-ranging digital multimeter
- 600V AC/DC voltage
- Current, resistance, diode and continuity
- Battery test function
What's in the box
- MM325 multimeter
- Test leads
- Batteries
- Instruction manual
Contents come from the current Amazon listing and can change — check the listing before buying.
Getting started with the Klein Tools MM325 Manual-Ranging Multimeter
With manual ranging, start on a range above what you expect and step down until the reading resolves — starting too low only gives an overload indication, but it is a good habit for voltage. Use the battery test position rather than plain DC volts when checking cells, since it tests under a small load and gives a more honest picture of a tired battery.
Who it's for
People who want one sturdy meter for electronics and occasional household electrical checks.
Alternatives worth considering
AstroAI True RMS 6000-Count Auto-Ranging Multimeter
Auto-ranging, True RMS and capacitance for bench electronics at a similar price.
Fluke 17B+ Digital Multimeter
A professional meter with a higher voltage rating when household electrical work becomes regular.
Klein Tools MM325 Manual-Ranging Multimeter: common questions
Is the Klein MM325 good for electronics?
Yes for the essentials — continuity, voltage, resistance and diode checks. It lacks capacitance and temperature modes, so a hobbyist who mainly builds kits may get more from an auto-ranging meter with those extras.
What does manual ranging mean?
You turn the dial to the range you expect, such as 20V for a 9V battery. It takes a moment more thought than auto-ranging, but the reading settles instantly and there are no surprises about which range the meter chose.
Can it test household outlets?
It measures AC voltage to 600V, so it can read an outlet, but mains work carries real risk. Follow the manual, use the correct socket and range, and leave anything beyond simple checks to a qualified electrician.
You might also like
AstroAI
AstroAI True RMS 6000-Count Auto-Ranging Multimeter
8.8 / 10
Auto-ranging, True RMS and capacitance without leaving the budget bracket.
Check Price →
Read full review →
We earn a commission, at no extra cost to you.
Fluke
Fluke 17B+ Digital Multimeter
9.2 / 10
The brand professionals trust, with capacitance, frequency and temperature built in.
Check Price →
Read full review →
We earn a commission, at no extra cost to you.
