The Klein Tools MM450 is a slim-profile True RMS auto-ranging digital multimeter rated CAT III 600V. Its compact form factor is approximately the size of a cell phone and fits in most pockets. It measures AC/DC voltage up to 600V, AC/DC current up to 10A, resistance to 50 MΩ, capacitance, frequency, duty-cycle, and temperature via thermocouple. The 4000-count LCD display features an optical sensor that adjusts contrast for ambient light conditions. Lead Alert safety caps and 6.6-foot drop protection are included. Backed by Klein Tools' 1-year limited warranty.
What makes the MM450 different from the MM420?
The MM450 has a slimmer profile designed to fit into smaller tool pouches and tighter spaces, while sharing the same True RMS auto-ranging platform at 600V. If you carry a multimeter in a packed belt pouch, the slim form factor is the key differentiator.
Does it include temperature measurement?
Yes — the MM450 includes thermocouple temperature measurement, allowing simultaneous thermal readings alongside voltage and current measurements in a slim package.
What measurements does the MM450 support?
True RMS AC/DC voltage up to 600V, AC/DC current, resistance, capacitance, frequency, continuity, diode test, and temperature via thermocouple.
Is it rated for panel work?
CAT III 600V covers distribution panels, branch circuits, and most residential and commercial electrical work.
Who is the MM450 designed for?
Electricians and HVAC technicians who want True RMS accuracy and temperature capability in a slim form factor that fits in standard tool pouches without the bulk of a full-sized multimeter.
# Klein Tools® MM450 Slim Digital Multimeter, TRMS Auto-Ranging, 600V, Temp **Model:** `MM450` **Brand:** Klein Tools **Category:** Multimeter > The Klein Tools MM450 is a slim-profile True RMS auto-ranging digital multimeter rated CAT III 600V. Its compact form factor is approximately the size of a cell phone and fits in most pockets. It measures AC/DC voltage up to 600V, AC/DC current up to 10A, resistance to 50 MΩ, capacitance, frequency, duty-cycle, and temperature via thermocouple. The 4000-count LCD display features an optical sensor that adjusts contrast for ambient light conditions. Lead Alert safety caps and 6.6-foot drop protection are included. Backed by Klein Tools' 1-year limited warranty. ## Specifications | Attribute | Value | |---|---| | Product Type | Digital Multimeter | | True Rms | Yes | | 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 | 50 MΩ | | Capacitance Range | 400 µF | | Frequency Range | 1 Hz – 50 KHz | | Temperature Range | -40–1832°F (-40–1000°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 | 6.5 | | Assembled Weight Oz | 9.1 | | Barcode (UPC) | 092644693755 | | Warranty | 1-year limited | ## What's Included - Multimeter - Carrying case - Test leads with CAT III/CAT IV safety caps - Thermocouple - Instructions - 2 x AAA batteries Source: https://www.jaspecs.com/klein-tools/multimeter/mm450-klein-tools-slim-digital-multimeter-trms-auto-ranging-600v-temp/