The Extech PQ3350-3 is a three-phase power and harmonics analyzer that can take up to 52,428 single-phase readings or 17,476 three-phase values. It has a big backlit LCD that can display up to 35 parameters on one screen while also displaying harmonics and waveforms. For single and three-phase systems with three or four wires. Includes four voltage leads with alligator clips and retractable plunger clips, eight AA batteries, a universal AC adapter, software, a USB interface cable, and a case. Current Probes are available separately.