The Klein Tools MM400 is an auto-ranging digital multimeter rated CAT III 600V designed for residential and commercial electrical work. It measures AC/DC voltage up to 600V, AC/DC current up to 10A, resistance to 40 MΩ, capacitance, frequency, duty-cycle, and temperature. The 4000-count backlit LCD display and 3.3-foot drop protection support daily job-site use. Features include data hold, diode test, and audible continuity. Thermocouple included. This product has been discontinued; the MM420 is the current replacement. Backed by Klein Tools' 1-year limited warranty.
Is the MM400 still available?
No — the MM400 has been discontinued and replaced by the MM420.
What was the MM400?
An auto-ranging average-sensing multimeter at 600V — the previous generation entry-level auto-ranging model before True RMS became standard at this tier.
What replaced it?
The MM420 (True RMS, auto-ranging, 600V, with temperature) is the direct current replacement.
# Klein Tools® MM400 Digital Multimeter, Auto-Ranging, 600V **Model:** `MM400` **Brand:** Klein Tools **Category:** Multimeter > The Klein Tools MM400 is an auto-ranging digital multimeter rated CAT III 600V designed for residential and commercial electrical work. It measures AC/DC voltage up to 600V, AC/DC current up to 10A, resistance to 40 MΩ, capacitance, frequency, duty-cycle, and temperature. The 4000-count backlit LCD display and 3.3-foot drop protection support daily job-site use. Features include data hold, diode test, and audible continuity. Thermocouple included. This product has been discontinued; the MM420 is the current replacement. Backed by Klein Tools' 1-year limited warranty. ## Specifications | Attribute | Value | |---|---| | Product Type | Digital Multimeter | | True Rms | No | | Auto Ranging | Yes | | Voltage Range Ac | 600V AC | | Voltage Range Dc | 600V DC | | Current Range Ac | 10A AC | | Current Range Dc | 10A DC | | Resistance Range | 40 MΩ | | Capacitance Range | 200 µF | | Frequency Range | 1 Hz – 50 KHz | | Temperature Range | 0–1000°F (-18–538°C) | | Low Impedance Loz | No | | Nist Calibrated | No | | Display Type | LCD | | Display Count | 4,000 | | Cat Rating | CAT III 600V | | Battery Type | 2 x AAA | | Overall Length In | 6 | | Assembled Weight Oz | 8.2 | | Barcode (UPC) | 092644690211 | | Warranty | 1-year limited | ## What's Included - Test leads - Batteries - Thermocouple - User manual Source: https://www.jaspecs.com/klein-tools/multimeter/mm400-klein-tools-digital-multimeter-auto-ranging-600v/