USB Hub Tester Voltage/Amps Power Meter Monitor Detector Tester Multimeter, Test speed of chargers, cables, capacity of power banks Current Voltage 1A discharge resistor, the voltage of 5.30 V, 1.02 A current, shows that the output 1A is ok! Displays Current (Amps), voltage and capacity (19,999 mah) Perfect for testing how fast a USB cable or USB power adapter charger is actually charging at 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. Test your iPhone or Android phone