Stand alone true RMS, data logging, polyphase power meter can measure up to 140 measurement parameters. Four voltage clips and three proprietary 1000 Amp CT clamps are included with meter. Meter has LCD display for real-time readings and uses a PC serial 4 megabyte of memory with compression or 4540 records with 53 variables. Has option to power self from monitored voltage. Sample rate: 1/second at 60 Hertz measures 2 cycles/secon with 65 samples/cycle.