ALLOSUN CAT III AC Current Probe Working with Multimeter DMM for ac Amp Measurement Digital Clamp Ammeter Tester Input: AC 600A Max Frequency Range: 50Hz - 60 Hz Output: 0mV - 600Mv, AC Output Sensitivity: 1mV / 1A Max working voltage: 600V ac rms, CAT III Accuracy: (3.0 % rdg + 5d) Operating temperature: 0 --50 , &lt; 80% RH Storage Temperature: -20 -- 60, &lt; 85% RH Max Conductor Size: 30mm Max Jaw Opening: 25mm The input impedance of ac Voltage range of the digital multimeter to be used with the Current Probe must be  1M, and the multimeters ac Voltage measurement range to be used must be  2V ac. Connect the output plugs of Current Probe to the ac voltage input terminals of the multimeter. Set the rotary switch of the multimeter to the desired ac voltage measurement range position, make sure that the selected range is not higher 2V ac for accurate measurement. Press the trigger and clamp the jaws around the conductor to be measured. Release the trigger slowly.