... .It has newly developed colorful displayer,which can directly show the working performance of proudcts.It takes smart,ligtness,high efficiency ... stabilize,no waveform distortion,high cost performance of AVR-II.AVR-III can be widely used in family,factory,laboratory and ... above is 8% degree of accuracy. If thedegree of accuracy is different, the quantites of relay will be changed also, for example input ...