Parameters: Adjustable output voltage: DC 50V-3700V Voltage display accuracy: 0.3% Output voltage error: ± 50V, resistance error, actual output 3650-3750V Adjustable output current: 50uA-5mA Output mode: constant voltage, constant current output Maximum power of the entire machine: 5 Voltage meter resolution: 0.1V below 100V, 1V above 100V Battery capacity: 700mA lithium battery Charging current: 550mA Charging interface: TYPE-C (red light for charging, green light for full charge) Charging adapter: 5V1A mobile phone charger can be used for charging Protection function: 80 over temperature protection (high temperature blue light) Lithium battery undervoltage: Blue light when the battery is below 3.3V Host weight: 108g (without any accessories) (Due to different product batches, the appearance , which does not affect the use) Colour:Blue Material:Plastic Package Contents: 1x Tester 1x English Instruction manual 10x clip test line accessory Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 3. Convenient to carry and store 4. Insulation testing between windings is also very convenient, such as for electric motors, power frequency , high-frequency , phase to phase insulation, and insulation testing of the outer shell iron core 1. It can also test the insulation voltage of objects. For example, insulation voltage testing between the two pins of switches, buttons, and connectors. 2. Compact product 5. Widely applicable and measurable: NIMOS/PMOS/IGBT/transistor/unidirectional thyristor/voltage regulator diode/light-emitting diode/rectifier bridge/varistor/ceramic gas discharge tube/electrolytic capacitor/withstand voltage valu