The 320 Series true RMS clamp meters is a complete line of tools engineered to produce noise-free, reliable measurements in the toughest environments. Designed to be long-lasting and easy to use, the 323, 324, and 325 clamp meters are ideal for rugged, all-purpose use in residential, commercial, HVACR and light industrial electrical applications. Series features include true-RMS ac voltage and current for accurate measurement of nonlinear signals; dc current, frequency, and resistance up to 40 kilohms for motor testing; CAT III 600 V/CAT IV 300 V safety ratings; slim, ergonomic design for comfortable all-day use; and a large, easy-to-read display. The 324 and 325 models offer a backlit display for easy viewing in any setting, contact temperature readings from 10 to 400°C (14 to 752°F) and capacitance measurements from 100 to 1,000 microfarad. The 325 model also offers dc current measurements up to 400 A, frequency measurements from 5 to 500 Hz, and min/max function.