The Klein Tools CL450 HVAC True-RMS AC/DC Digital Clamp Meter with Differential Temperature, Auto-Ranging, 1000V AC/DC is an automatically ranging true root mean square (TRMS) digital clamp meter that measures AC current via the clamp, AC/DC voltage, DC microamps, resistance, LoZ, continuity, frequency, duty-cycle, capacitance, and tests diodes via test-leads, and temperature via a thermocouple probe. The CL-450 offers dual-LCD backlit display for clear visibility in environments with low ambient lighting and a dedicated mode for capturing DC micro amp and inrush current.