The host comes with charging and discharging curves and records to observe the charging and discharging curves and view the maximum value Powerful computer host software APP Computer online background synchronization setting function HID online upgrade of host firmware update free upgrade function Simple wiring, easy to modify, strong versatility, true 4-wire wiring design, more accurate voltage measurement Test all kinds of battery capacity and DC power supplies Test all kinds of 0-420V DC power supplies and batteries, high-definition colorful screen, one screen displays multiple parameters, suitable for all working voltages of 0-420V lithium batteries, lithium iron phosphate, lead acid, nickel metal hydride and other batteries and DC power supplies Model: DT20 Measurement voltage range: 0-420V (5V power supply is required for the meter) Measurement current range: 0.3-300A Measurement capacity range: 0-99999Ah Curve function: Dual parameter curve can be paused/run Colour:Black Material:ABS Package Contents: 1x Battery/Power Tester 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.