The Extech PQ3350-1 is a three-phase power and harmonic analyzer that can take up to 52,428 single-phase measurements or 17,476 three-phase measurements. It has a big backlit LCD that can display up to 35 parameters on one screen and can display harmonics and waveforms at the same time. Single-phase, three-phase/3-wire, and three-phase/4-wire systems. The kit includes three flexible current clamps, four voltage leads with alligator clips and retractable plunger clamps, eight AA batteries, a universal power adapter, software, a USB interface cable, and a carrying box.