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We recommend this newly style of Digital Insulation Resistance Tester to you. It has fashionable design and improved electro circuit with more functions, higher precision and easier operation. This tester supports resistance range up to 20G ohm. Alternating current also can be tested. This newly digital insulation tester applys for all kinds of electric equipments and insulation materials such as transformer, electromotor, cable, switch, appliance, etc. It is a perfect electrical testing meter. Key Features: Three test voltages, measure insulation resistance to 20GΩ AC voltage measurement to 600V Low resistance buzzer Data hold, auto range Low battery warning Notice: Do not use this item for testing over AV 600V or high voltage. It's dangerous!!!