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The Klein Tools MM420 Digital Multimeter is a professional-grade, auto-ranging TRMS device designed for precise measurement of up to 600V AC/DC voltage, 10A current, and 50 MΩ resistance. Featuring Lead-Alert safety LEDs, a backlit LCD for low-light visibility, and rugged durability with a 2-meter drop rating, it’s engineered for demanding residential, commercial, HVAC, and light industrial environments. Complete with versatile testing functions and convenient hands-free options, it’s the essential tool for the modern technician.






| Manufacturer | Klein Tools |
| Part number | MM420 |
| Item Weight | 413 g |
| Product Dimensions | 23.7 x 12.9 x 9.7 cm; 412.77 g |
| Batteries | 2 AAA batteries required. (included) |
| Item model number | MM420 |
| Size | One Size |
| Color | Orange/Black |
| Style | w/Lead Alert |
| Material | Blend |
| Pattern | Multimeter |
| Power source type | Corded Electric |
| Item Package Quantity | 1 |
| Measurement Accuracy | 600V AC/DC |
| Display Style | LCD |
| Specification met | Cat Iii 600v Safety Rating |
| Special Features | Lead-Alert; Auto-Range; Min/Max Measurements; Backlight; Auto Power-Off; Data-Hold |
| Included components | Digital Multimeter, TRMS Auto-Ranging, 600V, Temp |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
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