Voltage tester series intelligent automatic voltage tester is specialized toall kinds of low-voltage insulation materials and equipment, electrical insulation resistance testing of the structure and the experimental apparatus. This instrument can adjust output current parameters. In the test, measure the object or product requirements in the test voltage under the provisions of the time, the pressure will be cut off power supply, Once the preset automatically interrupts the current breakdown voltage, current and also showed a breakdown, sound-light alarm signals that can withstand the test of whether the products stipulated experimental voltage. The GB47931.1 conforms to the provisions of IEC1010-1.