Insulating oil in electrical power apparatus serves two primary roles, as an insulator and a coolant. As an insulating liquid, oil’s most important property is a high dielectric strength and as a cooling liquid, a low viscosity is paramount. The principal nemeses of insulating oil are oxidation, contamination and excessive temperature. These enemies are managed through design, regimented installation processes and prudent operation of the oil-filled power apparatus.. Insulating Oil Tester Analog - Motorised | Digital – Motorised | Semi Automatic | Fully Automatic | Analog Battery Operated Insulation Tester | Analog Battery Operated Insulation Tester | AC High Voltage Test Set | DC High Voltage Test Set | DC & AC High Voltage Test Set | Primary Current Injectors | Secondary /Relay Testing Kits | CT PT Tester | Insulation Resistance Tester | AC & DC Voltage Divider | Time Interval Meter | Contract Resistance Meter.