Description Model : WI 2503 Range : 2500 Volts – 2500 Mohms Hand drive Insulation Tester is used for measuring insulation resistances of various electrical machineries, Control Panels, Switching Equipment, Insulators Cables, Wirings and various other devices ranging from Small Electrical Units to Large size Transformers. The instrument conforms fo Is: 2992:1980. Model : WI 2504 Range :  2500 Volts – 5000 MOhms Hand drive Insulation Tester is used for measuring insulation resistances of various electrical machineries, Control Panels, Switching Equipment, Insulators Cables, Wirings and various other devices ranging from Small Electrical Units to Large size Transformers. The instrument conforms fo Is: 2992:1980. Model : WI 2505 Range :  2500 Volts – 10,000 Mohms Hand drive Insulation Tester is used for measuring insulation resistances of various electrical machineries, Control Panels, Switching Equipment, Insulators Cables, Wirings and various other devices ranging from Small Electrical Units to Large size Transformers. The instrument conforms fo Is: 2992:1980.