Klein Tools CL390 400A TRMS Clamp Meter is a professional digital clamp meter designed for electrical maintenance, HVAC service, panel inspection, field troubleshooting, and general electrical measurement applications. With True RMS measurement technology, it provides accurate and reliable results across different load types. The device measures up to 400A AC/DC current through the clamp, while the test leads allow measurement of 600V AC/DC voltage, resistance, continuity, frequency, duty cycle, capacitance, and diode testing. Thermocouple temperature measurement support makes the product especially useful for HVAC maintenance and service applications. Integrated non-contact voltage detection provides safer operation with audible and visual alerts as the meter approaches a voltage source. The backlit display helps users read measurements easily in low-light environments, while the durable body structure delivers reliable performance in field conditions. Klein Tools CL390 is a compact, reliable, and versatile measurement solution for electricians, maintenance technicians, HVAC teams, and industrial field personnel.

Product Features

• Clamp body includes a side-mounted test lead holder and a rear mount for attaching an optional magnetic hanger, 69445 or 69417, for hands-free use.
• Non-contact voltage tester integrated into the clamp jaw.
• High-visibility reverse-contrast LCD display provides better readability in all ambient lighting conditions.
• Auto-ranging True Root Mean Square (TRMS) measurement technology for accuracy.
• Measures AC/DC current and NCVT with the clamp; measures AC/DC voltage, resistance, frequency, DC microamps, capacitance, duty cycle, diode test, and continuity with the test leads; measures temperature with a thermocouple.
• Temperature measurement with Type K thermocouple probe.
• Features Max/Min, Rel/Zero, and Data Hold functions.
• Auto power-off after 10 minutes to help preserve battery life.
• Includes carrying case, test leads with CAT III/CAT IV safety caps, thermocouple, instruction manual, and 3 AAA batteries.
• Low battery indicator and easily accessible battery compartment.
• Built to withstand drops from 2 meters.
• CAT III 600V, Class 2, double-insulated safety rating.
• Meets requirements for use in basic and controlled electromagnetic environments such as residential, office, and light industrial settings.