The Digital Insulation Resistance Tester series have high performance, safe configuration and improved electrocircuit. It has more function, higher precision, and easier operation. It’s also quakeproof, dustproof and dampproof and can fit work environment of outdoor. The output testing voltage can be changed between 100V/250V/500V/1000V/2500V/5000V for different item. The resistance can reach 200GΩ, the tester also can measure alternating voltage. This tester applys for all kinds of electric equipment and insulation materials such as transformer, electromotor, cable, switch, appliance, etc. Testing Voltage: 500V/1000V/ 2500V/5000V Insulation Resistance: 0.1M～200GΩ AC Voltage: 750V.