On USB Current Voltage Capacity Tester Meter Battery for Mobile Phones Charger Capacity Tester v High Voltage Detector Features:1. This is a mini USB meter. It can measure voltage, current, time and capacitance.2. You can easily measure the USB port (USB to computer, mobile phone charger, car charger, mobile power, etc.) and the working current of the device and the discharge capacity of the output voltage, the performance. It can display all data clearly.3. It can judge the charging performance of the charging cable, this tester can meet the requirements4. Fit for factories, laboratories and personal use, wide range and easy to use, easy to take by yourself.5. No extra power supply, plug and play. Safe charging and mastering real-time charging data. Description:The USB battery capacity tester allows you to achieve safe charging and real-time monitoring of the charging instruction. Specifications:Size: 59*23*13.5mm Voltage: 4-20v ± 1%Current: 0-3A ± 1%Time: 0-99h Capacity: 0-9999mah Package Included:1*Battery Capacity Tester Notes:1. Please allow 0-1 inch error due to manual measurement. Thank you for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object.