... and RS-232 interfaces for convenient system communication,Calibration performed without opening the ... , AC voltage, DC current, AC current,2-wire resistance, 4-wire resistance, frequency, period, continuity, diodeMathematic ... setting files can be stored and loadedCalibrationRecommended Fluke5520A with TH1951/TH1961 Accurate Calibration software ( option ... 120000 digits VA82 5 1/2digits V&A multimeter