Amprobe ACD-51NAV 600A HVAC Power Quality Clamp Meter HVAC clamp meter with temperature, DC microamps, in-rush current and capacitance True-RMS Voltage up to 1000V AC/DC, AC Current up to 600A, resistance, frequency, THD (total harmonics distortion) and individual harmonics from 1 to 25, power (kW), power factor Temperature from -50 F to 1832 F (-50 C to 1000 C) Low pass filter for variable frequency drives