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The Klein Tools CL390 is a professional-grade digital clamp meter featuring auto-ranging TRMS technology for accurate AC/DC current and voltage measurements up to 400 amps. It includes a high-visibility reverse-contrast LCD for easy reading in any light, integrated non-contact voltage detection, and versatile testing capabilities including resistance, continuity, frequency, capacitance, diode tests, and temperature measurement via thermocouple. Designed for hands-free convenience with a test lead holder and optional magnetic hanger, it’s built to meet the demands of professionals who require precision and durability on every job.






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