Features: 1. At the same time can test the insulation voltage of the object. Such as switches, buttons, connectors between the two legs of the insulation voltage test. 2. Compact product 3. Easy to carry and organize 4. It is also very convenient to test the insulation between windings, such as motor, industrial frequency transformer, high frequency transformer, phase-to-phase insulation, insulation measurement of the shell core. 5. Wide range of applications can be measured: NIMOS / PMOS / IGBT / transistor / unidirectional SCR / voltage regulator diode / light-emitting diode / rectifier bridge / varistor / ceramic gas discharge tubes / electrolytic capacitors / the withstand voltage value. Parameters: Adjustable output voltage: DC 50V-3700V Voltage display accuracy: 0.3% Output voltage error: 50V, resistance has error actual output 3650-3750V Adjustable output current: 50uA-5mA Output mode: constant voltage, constant current output Maximum power of the whole machine: 5 Voltmeter resolution: 0.1V below 100V, 1V above 100V Battery capacity: 700mA lithium battery Charging current 550mA Charging interface: TYPE-C (charging red light, full green light) Charging adapter: 5V1A cell phone charger can be charged Protection function: 80 over temperature protection (high temperature light blue) Lithium battery undervoltage: battery below 3.3V amount of blue light Machine size: 98*70*37 Host weight: 108g (without any accessories) Package includes: Tester *1 Instruction manual *1 Alligator clips test line accessories *10