... .I. Features & Functions 1. with seven functions: voltmeter, ammeter, phase meter, phase sequence meter, frequency counter, power meter, power factor meter ... display the data and diagram), convenient to review.8. Auto switch the measurement range, soft ware calibrate.9. High accuracy ... ≤1%50Hz±1Hzgeometric center of the jaw100V±25V1A±0.2A (2) phase:±1°, resolution 0.1°.remark: current less than 20mA, ...