multifunction battery tester, this meter is mainly used to test all kinds of battery's voltage, discharge current, discharge power, discharge impedance, internal resistance, capacity, dump energy, energy consumption and running time, and display the measurement data through LCD screen 1.Voltage Measuring range: 0-200V. (when the test voltage is le than 8V, please use the independent power supply mode) 2. Current Measuring range: 0-10A(built in shunt) 0-300A can set 50A, 100A, 200A,300A four range depend on the external shunt, the factory default is 100A. 3. Power Measuring range: 0-2000W (10A) 0-60000W(0-300A). 4 Impedance Measuring range: 0-1000ohm (Impedance=Voltage/ Current) 5 Internal Resistance Measuring range: 0-999 milliohm Internal resistance= (Full voltage - Bring load voltage) / Bring load current, when the bring load voltage is larger than the maximum voltage, the internal resistance is zero. 6 Capacity Measuring range: 0-1000AH 7. Accumulate energy consumption Measuring range: 0-9999kWh 8. Running time Measuring range: 0 ~ 999 hour (without load the time will not accumulate) 9. Dump energy Dump energy is display via the battery symbol, totally 10 grids, every grid present 10% energy. Dump energy is calculated via the current battery voltage value, before test you should preset the full voltage and the cut-off voltage depend on the battery type; every grid voltage = (the highest voltage - the lowest voltage) / 10.