• A simple little diagnostic tool.Functions well to monitor battery charging status. Shows volts supplied and amps drawn. Answered a few questions of your own as to why some devices charged better than others
• Great little digital multimeter for testing voltage/amps output and power draw for usb-driven devices. Easy to read, helps identify which chargers put out the most charging current.This does do the trick for trouble shooting
• This foolproof usb meter has been a real benefit in sorting phones, cables and wall warts adapters into how well they are working for each of these apple devices.Are they capable of supplying adequate power
• A very handy USB power monitor to have around for checking both Vdc and the current a USB device would draw with re-charging and go to zero when fully charged
• Unlike other USB multimeter, which displays voltage and current in alternate mode and you have to wait for the other mode. This device displays both voltage and current simultaneously!

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