Greenlee DML-430A ESM Digital Logging Meter Data logging capability stores 87,00 single-channel or 43000 dual-channel measurements AC+DC True RMS gives accurate readings on complex waveforms Use optional USB interface DMSC-9U to transfer data to PC or for direct-to-Piece logging Backlit LCD displays 2 readings with 10000 count resolution Measures voltage, current, resistance, conductance, frequency and capacitance