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ESAW EEC-10676 Earth Resistance by fall of Potential MethodTechnical Specifications:One No of Inbuilt power supply of range 0-12VDC / 2 ampere.Two No. of Digital panel meter for voltage measurement of Range 0-20V.One No. of DPM for Current measurement of range 0-200 mA.Three No. of spoke' made of copper 10mm thick & 750mm long with high-density..