LED USB Charger Voltage Current Meter Mobile Battery Tester Power Detector
25. Jul 2016
Cute but there's better versions
This is handy, but there's another version with 2 sets of LEDs - 1 shows voltage, 1 shows current. This alternates every couple seconds between current and voltage. Also, the other design has the USB coming out the end, which seems to be more usable, at least for me.
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