Portable LCD Mini USB Power Bank Voltage Current Detector Tester Digital Voltage Meter Workable range: U= 3 - 8V, A= 0 - 3A Resolution: Voltage 10mV, current 1mA Error Range: Voltage &lt; 1%, current &lt; 2% Full-scale Voltage Drop: 200mV Workable Temperature: 0 - 60 centidegree