I3C USB Voltage/Amps Power Meter Tester Charging System Tester USB Voltage Monitor Test Speed of Chargers Fast Charging, Cables, Capacity of Power Banks Displays Current (Amps), voltage and capacity (19,999 mAh) Can handle charging speeds up to 3.5A (3,500 ma) and 3v-7v Store charging data in memory. Flashes to alert of low or high voltage issues Test using a USB charger, battery power bank or Micro USB Cable Widely used: Perfect for testing how fast a USB cable or USB power charger, such as power bank, solar charger