USB Volt Amp Meter – Dual Digital Display Voltage Tester

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

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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.