Rishabh Instruments Pvt. Ltd. Manufactures Precise Multirange Insulation Tester. Rishabh Instruments Pvt. Ltd. Is an ISO9001:2000 certified company. Rishabh Instruments Pvt. Ltd. Also manufactures digital panel meter, analog panel meters, current transformers, protective trip relays, digital etc. Precise Multirange Insulation Tester is device that is used to measure the insulation across a device. This device is also known as a megger. The Precise Multirange Insulation Tester is available in various models with capacities ranging from 0 to 200MW. The Precise Multirange Insulation Tester is very accurate and weighs approx. 2.8 kg.