Extech MM570A MultiMaster High-Accuracy Multimeter True RMS multimeter with 50,000/500,000 count LCD and temperature function Full range multimeter functions with 0.02-percent basic DCV accuracy and up to 100kHz True RMS ACV bandwidth 50,000 count (500,000 for DCV and Hz) backlit LCD display with bargraph Special True RMS combination AC+DC function for measurements of rectified AC (non-symmetrical) voltage and current waveforms Filtered frequency function with adjustable trigger levels for variable speed motor drives and high voltage applications