Bench Top Analogue Insulation Tester operates on a power supply of 230V AC and also on rechargeable lead acid batteries. The Insulation Tester has been equipped with automatic external voltage detection and warning facility measuring high insulation up to 500 Ohm. The Insulation Tester is protected against accidental connection to 230V/440 AC with accurate and precise resistance measurement using ratiometric measurement technique. Bench Top Analogue Insulation Tester has adequate safety features and automatic discharge of capacitive circuit, after insulation test