Item Type: Battery Tester Material: Iron Function: Intelligent battery power comprehensive tester ModelMD150MD250 Power Supply ModeDC 12V 2A Constant Discharge Current Adjustment Range0 1-20A Maximum Discharge Current Error0 01A Maximum Discharge Power150W250W Discharge VoltageDC 0 5V-30V Discharge ModeConstant Current (CC) Constant Voltage (CV) Constant Resistance (CR) Constant Power (CP) Dynamic Load Test (DS) Constant Current Resistance Range0 1-30 Discharge Current Adjustment Accuracy0 1A Internal Resistance Range1mR-500mR Maximum Discharge Capacity99999mAH Maximum Discharge Time99: 99: 99s Reverse Polarity Protectionand- Over Voltage Protection OVPStop Working When Greater Than 30V Over Current Protection OCPStop Working When Greater Than 10AStop Working When Greater Than 20A Over Power Protection OPPStop Working When Greater Than 150wStop Working When Greater Than 250w Built In Over Temperature Protection OTPStop Working Above 751Power Checker: Can be applied for the test of current, power, dynamic test, ageing, etc of various DC power supplies 2Practical Use: Also can be used to test the discharge time, capacity internal resistance of a variety of batteries 3Clear Display: LCD screen display, human computer interaction interface true 4 wire measurement ensure high accuracy 4Reliable Work: Comes with power down memory, over voltage protection, over current protection so on for safer working 5Easy to Operate: Having been connected to computer through USB cable, the monitor allows you to query historical curves 1 x Battery Tester 1 x Testing Line (1 Set) 1 x USB Data Cable