Amprobe DM-III Multitest F 3000A Power Quality Recorder Measures and records power quality of single-phase or three-phase (3- or 4-wire) power supply systems for installing and maintaining electrical systems Provides individual or simultaneous measurement of current, voltage (including sags or surges), energy, peak demand, frequency, harmonics, phase sequence, power factor, and active, reactive, and apparent power, and tests for insulation and ground resistance of wires, cables, transformers, and motors Records measurements for up to 64 parameters over a period of time ranging from one hour up to several months to track changes in the individual electrical properties of a power system or the overall power quality provided by the system Comes with three flexible current transducers that can accommodate conductors up to 7" (178 mm) in diameter, and three clamp-on current transducers that can accommodate conductors up to 2" (50 mm) in diameter, for measuring current without touching or interrupting the circuit Meets International Electrotechnical Commission (IEC) safety standard 61010 and is certified for category III installations up to 600V