Klein Tools MM400 Digital Multimeter 600V Auto Ranging

Product Description

The KLEIN TOOLS MM400 is an auto-ranging digital multimeter rated for 600V AC/DC measurement in residential, commercial, and light industrial electrical environments. It measures AC and DC voltage up to 600 volts, AC and DC current up to 10 amps, and resistance, while also handling temperature, capacitance, frequency, and duty cycle readings. The MM400 carries a CAT III 600V safety rating and is built to survive a 3.3-foot drop, making it a dependable daily-use instrument for licensed electricians and HVAC technicians working across a range of field conditions.

This multimeter is designed for use in basic controlled electromagnetic environments including residential, business, and light industrial locations. Its auto-ranging function eliminates the need to manually set measurement ranges, reducing setup time during troubleshooting. It also supports diode testing and continuity checks, covering the core diagnostic tasks that electricians, HVAC technicians, and industrial maintenance professionals encounter on a typical service call. The kit ships with test leads, a thermocouple with adapter, and batteries, so it is ready to use out of the box.

Key Features

• Auto-ranging measurement across voltage, current, resistance, capacitance, frequency, and duty cycle
• 600V AC/DC voltage range with CAT III 600V safety rating
• 10A AC/DC current measurement capability
• Temperature measurement via included thermocouple with adapter
• Diode testing and continuity check functions built in
• Survives a 3.3-foot drop for durability under daily job-site use
• Low battery indicator and easily accessible battery compartment

Compatibility

Designed for use in basic controlled electromagnetic environments such as residential, business, and light industrial locations where CAT III 600V rated test equipment is appropriate.

Installation Notes

Installation and use should be performed by a qualified electrician or licensed technician familiar with safe metering practices. Always de-energize circuits before connecting or disconnecting test leads where permitted by the work procedure, and verify the meter's CAT III 600V rating is appropriate for the circuit under test. Follow applicable NEC guidelines and local codes when performing electrical measurements. Never exceed the rated input limits for any measurement function.

Technical Specifications

• Voltage Measurement (AC/DC): Up to 600 volts
• Current Measurement (AC/DC): Up to 10 amps
• Functions: Voltage, Current, Resistance, Temperature, Capacitance, Frequency, Duty Cycle, Diode Test, Continuity
• Safety Rating: CAT III 600V
• Drop Resistance: 3.3 feet
• Weight: 6.2 pounds
• Unit of Measure: EA
• Package Quantity: 6

Standard Information

• Brand: KLEIN TOOLS
• Manufacturer Part Number: MM400