... testing5. Digital multimeter, voltage, current, resistance and capacitance can be tested, continuity testing, diode testing6. Optical power meter, ... -interface and Multi-baud rate. Support RS232 ,RS485 and RS422 interface; baud rate ranging from 150, 600 ... from controlling devicePOWERPower AdapterDC5V, 2ABatteryBuilt-in 3.7V Lithium polymer battery ,3000mAhRechargeableAfter charging 3-4 hour, working ...