Klein Tools CL390 AC/DC Clamp Meter – Auto-Ranging TRMS, NCVT, Hi-Vis LCD

Overview

The Klein Tools CL390 is an automatically ranging true RMS digital clamp meter built for professional electricians and technicians who value versatility in a single tool. By clamping onto a conductor, it measures AC and DC current and non-contact voltage (NCVT) without disconnecting circuits. When needed, test leads extend its capabilities to AC/DC voltage, DC microamps, resistance, continuity, frequency, capacitance, diodes, and temperature via a thermocouple probe.

Its combination of broad measurement options and practical design makes it a flexible choice for a variety of tasks, from panel work to field service. The CL390 is crafted to stay dependable under daily use, with attention to readable data and easy-to-use features that help you work confidently around energized equipment.

Key capabilities

• AC/DC current and NCVT through the clamp for quick, non-intrusive checks
• AC/DC voltage, DC microamps, resistance, and continuity testing via test leads
• Frequency, duty cycle, and capacitance measurements for signal and component analysis
• Diode test and a thermocouple temperature probe for temperature-aware troubleshooting

Design and usability

• Auto-ranging True RMS technology provides precise readings across a range of loads and waveforms
• Integrated non-contact voltage testing in the clamp jaw helps with quick voltage checks
• High-visibility reverse-contrast LCD ensures readable data in dim or bright environments
• Test lead holder on the side and optional magnetic hanging accessories for hands-free operation

Why choose CL390

Designed for busy jobsites, the CL390 consolidates many measurement tasks into one compact tool. It offers the reliability and build quality Klein Tools is known for, backed by a long-standing American heritage. While no single tool can guarantee outcomes, the CL390 provides a broad set of capabilities that support informed decision-making during electrical work and diagnostics.

With over 160 years of toolmaking experience and six generations of engineering expertise, Klein Tools continues to manufacture with quality materials and careful workmanship. The CL390 embodies that tradition, delivering a versatile instrument that fits professional workflows while staying ready for daily demanding use.