Current Transformer, Energy Meter Calibration, Power Quality Analyzer manufacturer / supplier in China, offering Gfuve 0-1800ω 4/3/2 Pole Ground Pile Resistance Test Clamp T-3730, T-3630e Advanced Multifunction 4/3/2 Pile Earth Ground Resistance Tester, Gfuve Ground Pile Resistance Test Clamp T-3730 and so on.