I just placed an order for this LCD USB Charger Capacity Current Voltage Tester Meter. It looks like a much better than the one I currently have. I also saw this Digital Display 3V-30V Mini USB Doctor QC2.0 Current/Voltage/Charger/Capacity/Tester and wonder if anyone has used it. It says it is capable of measuring up to 30 Volts (on a USB port)?
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