... . Portable and handheld 4.Dual-channel input measuring I. IntroductionDF-200 Double Clamp Digital Phase Meter is special designed for voltage ... )% RH(3) Wave forms of measured signal, sine wave β=0.02(4) Frequency of measured signal(50±0.2)Hz(5 ... pliers, 2×200g6. Storage ConditionsTemperature, -10°C~50°C DF-200 Dual-clamp Digital Phase Meter