UNI-T UT658 USB tester – a tool to test the quality of charger/power bank.  It can give a comprehensive detection for the charging equipment, such as output voltage, output current, output capacity, output voltage stability, etc. You may use UNI-T UT658 to test charging current with different charging cables, allowing you to select the optimal charging cable to save the charging time. Features: Real-time detection: test voltage, current, and charging capacity. DC3-9V voltage test range, 0-3A current range, ±1% accuracy Voltage alarm function: when the voltage is higher than 5.3V(display "H") or lower than 4.7V(display "L"). LCD display with multiple data Data storage: 10 groups of capacity data Specifications: Input voltage range 3 V - 9 V Voltage resolution 0.01 V Voltage monitoring accuracy ±1% Current monitoring range 0 A - 3 A Current resolution 0.01 A Current monitoring accuracy ±(1%+2) Energy (Capacity) 0-9999 mAh Display LCD, 26 × 17 mm Size 83 × 29 × 12 mm Weight 28 g Package includes: 1 x USB tester UNI-T UT658