... . Portable and handheld 4.Dual-channel input measuring I. IntroductionDF-200 Double Clamp Digital Phase Meter is special designed for voltage, current ... jaw, Optional position(6) Amplitude range of measured signal when measuring phase, 100~220V, 0.5A~1.5A(7) External reference ... jaw, Optional position.(6) Amplitude range of measured signal when measuring phase, Phase U1-U2, 30V~500V Phase I1-I2, 10mA ...