Klein Tools
Klein Tools MM400
Klein Tools built its reputation with tradespeople, and the MM400 shows why. It's rugged, accurate, and designed to be used one-handed in an awkward spot. Not as technically impressive as the UT61E+, but it's the meter you want if you're doing real electrical work.
True RMSCAT III 600V4,000 count
8.6/10
Buy on Amazon · $60$59.99
Specifications
| Display Count | 4,000 |
| CAT Rating | CAT III 600V |
| DC Voltage | 0.1mV – 600V |
| AC Voltage | 0.1V – 600V |
| Current | 0.1mA – 10A |
Features
✓True RMS
✓Auto-ranging
✓Capacitance
✓Temperature
✓Frequency
✓Diode Test
✓Continuity
✓Bargraph
What We Like
- ✓Rugged overmold design survives drops that would destroy cheaper meters
- ✓True RMS with CAT III 600V rating for real electrical work
- ✓Built-in NCV (non-contact voltage) tester
- ✓Temperature measurement via K-type thermocouple
- ✓Easy one-handed operation with large, well-spaced controls
Limitations
- ✗4000-count display is lower resolution than UT61E+ at similar price
- ✗No data logging or PC connectivity
- ✗Slightly bulkier than the Fluke 117 — less comfortable in tight spaces
Klein Tools MM400
$59.99 — CAT III 600V · 4,000 count