USB Charging Current Voltage Tester USB Voltmeter Ammeter
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020
Easy-to-use USB Voltmeter Ammeter
USB Voltmeter Ammeter
USB Charging with USB Voltmeter Ammeter

USB Charging Current Voltage Tester USB Voltmeter Ammeter

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  • Product SKU: KG928
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The USB Charging Current Voltage Tester USB Voltmeter Ammeter is a handy device designed to measure and display the current and voltage of USB charging ports. With this tester, you can easily monitor the charging performance of your USB devices, ensuring safe and efficient charging.

Help! This patient is heating up! Is the voltage too low? Is the current draw too high? Is there a doctor in the house? Oh, thank goodness, the USB Charger Doctor (Voltmeter Ammeter) is here! Right on time…Doctor, can you tell us what the current draw is? What about the voltage? Thanks to the Doctor, you will now be able to watch and care for your USB-powered projects.

Use the USB Charger Doctor to measure the working voltage and current output for any USB port and project. This blue 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 the 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 flips between voltage and current readouts every 3 seconds or so. It’s a very handy tool for testing USB devices, checking load levels, and debugging battery chargers and boost converters. It’s a little chunkier but more numerical than our USB Power Gauge Mini-Kit. It’s also not open source so check out the USB Power Gauge mini kit if you want to hack together your own power gauge indicator.

Accurate Charging Performance Monitoring - USB Voltmeter Ammeter

Monitor the charging performance of your USB devices accurately with the USB Charging Current Voltage Tester. This device acts as a voltmeter and ammeter, providing real-time readings of the voltage and current flowing through the USB port. Stay informed about your device's charging status for optimal charging efficiency.

Safe and Efficient Charging - Comprehensive USB Testing

Ensure safe and efficient charging with the comprehensive testing capabilities of the USB Voltmeter Ammeter. It allows you to identify charging issues, such as overcurrent or Undervoltage, which may affect your devices. This tester helps you make informed decisions to safeguard your devices during charging.

Portable and Easy to Use - USB Charging Companion

The USB Charging Current Voltage Tester is portable and easy to use, making it a perfect companion for your USB charging needs. Its compact design allows you to carry it anywhere and test USB ports on various devices, such as smartphones, tablets, power banks, and more. Stay in control of your charging experience with this user-friendly tester.

Technical Details

  • Voltage range: DC 3.3V to 7.5V
  • Maximum Operating Current (A) : 3
  • Resolution: voltage 10mV current 10mA
  • Working temperature: 0-60℃
  • Full-scale voltage drop: 200mV (when measuring current)
  • Error: voltage<±1% current<±2%

Physical Attributes

  • L X W X H (mm): 53 X 20 X 15
  • Color: Blue
  • Material: ABS
  • Weight (gm): 17

Application examples

  • It is convenient to measure the output voltage of the USB port and the working current of the device; it is small in size, no power supply and other auxiliary equipment are needed, plug and play
  • It can detect whether the voltage and current output by the USB charger meet the standard; it is suitable for factories, laboratories, and users.
  • Detect whether the voltage of the mobile phone charger can meet the standard DC5


  • Compact and easy to carry, no additional power supply, plug, and play
  • It can easily measure the output voltage of the USB port and the device operating current or load voltage
  • Detect any USB charger such as PC USB, home charger, car charger
  • The wide range of applications, any phone, any electronic product, easy to use
  • Suitable for factories, laboratories, and personal use

Product Video

Package Includes

  • 1 x USB Charging Current Voltage Tester USB Voltmeter Ammeter

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