The PRO DIT-925 and PRO DIT-927 series High Voltage Insulation Resistance Testers are intelligent, high-end insulation resistance testers, well-developed by METRAVI. The instruments come with perfect test functions of various insulation resistance parameters and excellent anti-interference ability. They can be used in 220kV Sub-station and have no Corona effect.The touch screen can be very convenient to check and analyse the recorded historical data. The fully isolated USB interface uploads the test data to the PC safely. Suitable for insulation resistance testing of cable, motor, generator, transformer, mutual inductor, high voltage switch, arrester and other large equipments. Features Insulation Resistance measurement (IR); Polarisation Index measurement (PI); Absorption Ratio (DAR); Ramp Test mode (RAMP) ; Filtered Resistance test (FR), Voltage measurement (V); Current measurement (nA).