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The KLEIN TOOLS MM420 is a robust, auto-ranging TRMS digital multimeter designed for professionals who demand accuracy and durability. It measures up to 600V AC/DC voltage, 10A AC/DC current, and 50 MΩ resistance, featuring safety-enhancing lead-alert LEDs, a backlit display for low-light conditions, and a rugged build that withstands 2-meter drops. Complete with test leads, thermocouple, and batteries, it’s engineered for seamless, hands-free operation in residential, commercial, HVAC, and light-industrial settings.






| Brand | KLEIN TOOLS |
| Power Source | Battery Powered |
| Style | Auto-Ranging |
| Color | Orange/Black |
| Item Weight | 0.91 Pounds |
| Item dimensions L x W x H | 9.33 x 5.08 x 3.82 inches |
| Min. Operating Voltage | 9 Volts |
| Specification Met | Cat Iii 600v Safety Rating |
| Upper Temperature Rating | 60 Degrees Celsius |
| Measurement Type | Multimeter |
| UPC | 092644693748 |
| Manufacturer | Klein Tools |
| Global Trade Identification Number | 00092644693748 |
| Part Number | MM420 |
| Item Weight | 14.6 ounces |
| Product Dimensions | 9.33 x 5.08 x 3.82 inches |
| Item model number | MM420 |
| Batteries | 2 AAA batteries required. (included) |
| Is Discontinued By Manufacturer | No |
| Size | One Size |
| Finish | Brushed |
| Material | Blend |
| Pattern | Multimeter |
| Shape | Rectangular |
| Item Package Quantity | 1 |
| Measurement Accuracy | 600V AC/DC |
| 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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