Amprobe ACD-41PQ [2730760] 1000A Power Quality Clamp Meter with Temperature. The Amprobe ACD-41PQ provides a simple and effective way to verify if the electrical system is affected by harmonics. Add on troubleshooting capabilities with the ACD-40PQ data-logging feature or get complete power analysis with the ACD-41PQ. Increase measuring efficiency with an optional PC interface kit. THD-F is defined as: (Total Harmonic RMS / Fundamental RMS) x 100%. The Amprobe ACD41PQ Measurements Total Harmonics Distortion THD, AC/DC Voltage up to 600V, AC Current up to 1000A, Resistance, Frequency, and Temperature. The meter has many features including AutoTect, audible continuity, auto power off, auto polarity, data hold, and a large, easy to read LCD display with backlight. The ACD-41PQ accommodates conductors up to 1.77" (45mm) in diameter and comes complete with intalled batteries, thermocouple and carrying case.