Features: The tester USB Charger doctor can easily measure the output voltages of the USB port and the device. Can easily measure the USB ( PC USB, cellphone charger, car charger, mobile power, etc. ) port and device operating current and the output voltages charge-discharge capacity, performances, and judge the performances of the charging cable charging equipment, this tester can meet the requirements. Compact, no power, and other ancillary equipment, Plugs and Plays. Secure charging and know your charging data. USB charger output voltages and current are standard suitable for factories, Laboratory and users. Specifications: Material:ABS Voltages: 3.3-30V (0.01 V) Current: 0-5.1A (0.01 A) Size:Approx.6.3cm/2.48''x6.3cm/2.48'' Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x USB Charger Tester