Very handy tool – USB Votage and Current Meter with OLED Display. Test USB In-Line Voltage and working current or any USB port and project. This dongle plugs between a USB device and passes the data lines through. The OLED display shows off voltage, watts, amps and mAH readings and instantly reads the numbers out for testing devices such as chargers, cables and cell phones. Also, you can flip the display 180° with a button on the back.
This meter can be used for 3.7-13VDC input voltage and upto 3A current and very useful to check load levels, debug battery chargers or boost converters.
Buy USB Voltage Meter with OLED Display from Pakronics: