Useful for testing USB Power Supplies and determining if the USB on a computer is powerful enough to run USB based accessories.

Useful in troubleshooting cheap long USB cords, especially with tablets because a long length cord with too small conductors causes voltage drop and low charge current when a tablet demands high current charging

Nice USB power meter

I have also found that some inexpensive or old or invisibly damaged usb charger cords really stem the current flow

Very satisfied with this device, excellent USB sync/charge tester

Fit: Solid USB connection