Accuracy Class: New USB Charging Current Input voltage: 0-9V Output voltage: 0-9V Measuring range: 0-9V The voltage resolution: 0.01 V Type: USB Charger Doctor Input/output ammeter: 0A - 3A Ammeter resolution: 0.01 A Precision: plus or minus 1% Test content: voltage， current Communication function: Yes Data calibration function: Yes Size (L x W x H): 73.2mm x 28mm x 15mm (28.6" x 10.9" x 5.9") Port: 2 Plug and Play Package Content: Ammeter Voltage Charger USB Detector Tester