" Delta" makes Earthing Compliance Test Panel for various appliances. This panel has high output impedance, adjustable current source 0 -30.0 A @ 6 V max. By measuring the mV-drop between earthing terminal of the plug & accessible metal part of the appliance body , earthing resistance has to be measured. Current to be passed depends on the standards specified for that appliance & the resistance has to be less than specified milliohms.