Dual USB Voltage And Current Tester


This simple device can be used to operate or test servo motors. There are 3 modes to check servos;

  1. Manual mode: turn the knob
  2. Neutral mode: make the servo go back to the neutral point
  3. Automatic: window wiper mode: make the servo swing like a window wiper in the biggest angle. Push button to change between modes. Lights indicate mode.

You can connect 1-3 servos simultaneously. It can also be used to check the operation of any servo motor whether fitted or not.


Dual USB Voltage and Current Tester

This is a great volt and amp meter to see the load used by modules and microcontrollers. You can easily see, as an example, how much power is consumed by your microcontroller project.

Use the USB Charger Doctor to measure the working voltage and current output for any USB port and project. This plastic dongle plugs between a USB device and passes the data lines through. There’s a 0.05-ohm resistor in line with the power pin that is used to measure the current draw. The Doctor’s digital display instantly reads the numbers out for testing devices such as chargers, cables, and cell phones.

You can use this device from 3.5-7VDC input voltage (although most USB devices tend to hover around 4.75 to 5.25) and up to 3A of current. It displays both voltage and current readouts. It’s a very handy tool for testing USB devices, checking load levels, and debugging battery chargers and boost converters.


  • Voltage range: 3.3V-9V
  • Current range: 0-3A
  • Voltage display: red
  • Current display: blue
  • Output: 2 USB
  • Size: 52mm x 34mm x12mm
  • Weight: 16g


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