Monitor Your USB Power with Precision

The KOQZM USB Voltage & Current Tester gives you instant, accurate readings of voltage, current, power, and more — right from your USB port. Whether you're an electronics enthusiast, hardware engineer, or simply want to verify your phone charger is performing correctly, this compact plug-and-play meter delivers professional-grade data in the palm of your hand. Made in Mainland China.

Key Features

High Accuracy Dual Digital Display: Simultaneously shows voltage and current with ±1% error margin, giving you reliable real-time readings at a glance.
Multi-Function Testing: Goes beyond basic volt/amp measurement — also tests temperature, power supply output, resistance, and capacitance. One tool for a wide range of diagnostic needs.
Plug & Play Convenience: No software, no setup, no complicated menus. Simply plug it into any USB port and get instant readings. Intuitive user interface for beginners and pros alike.
Wide Compatibility: Works with USB-A and USB-C interfaces and supports fast-charging protocols including QC2.0, QC3.0, and USB Power Delivery (PD) — compatible with Android phones, iPhones, tablets, laptops, power banks, and more.
Compact & Portable: Lightweight, pocket-sized design makes it easy to carry in a tool bag, backpack, or laptop case for use at home, in the lab, or on the go.

Technical Specifications

Test Voltage Range: 3V – 8V
Test Current Range: 0A – 3A
Measurement Error: ±1%
Supported Protocols: QC2.0 / QC3.0 / USB-PD
Display: Dual Digital LCD
Origin: Made in Mainland China

What's in the Box

1 × USB Volt/Amp Meter Tester

Related Products You May Like

For more information on USB charging standards and electrical safety for consumer electronics, visit the U.S. Consumer Product Safety Commission – Electrical Safety Resource Center.

Learn more: Multimeter

Frequently Asked Questions

Q: What devices is this USB voltage and current tester compatible with?

A: This USB volt amp meter is compatible with a wide range of devices including Android phones, iPhones, tablets, laptops, power banks, and any device that charges via USB. It supports fast-charging protocols QC2.0, QC3.0, and USB Power Delivery (PD), making it highly versatile for modern electronics.

Q: Do I need any special software or setup to use this USB power tester?

A: No setup is required. The tester features a true plug-and-play design — simply insert it between your charger and device. The dual digital display instantly shows live voltage and current readings without any app, driver, or configuration needed.

Q: What parameters can this tester measure beyond voltage and current?

A: In addition to voltage (3V–8V) and current (0A–3A), this multi-function tester can also measure temperature, power supply output, resistance, and capacitance — making it a comprehensive diagnostic tool for electronics enthusiasts, engineers, and lab technicians.

Made with care

Great value

Elegant design

Quality materials

This product is crafted with quality materials to ensure durability and performance. Designed with your convenience in mind, it seamlessly fits into your everyday life.

We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.

We are committed to ensuring a positive shopping experience for all our customers. If for any reason you wish to return an item, we invite you to reach out to our team for assistance, and we will evaluate every return request with care and consideration.