Main Features

• Real-time voltage and current display: shows USB voltage and charging current directly on the digital screen.
• Voltage range from 3V to 9V: suitable for common USB charger and power bank testing.
• Current range from 0.1A to 3A: useful for checking charging current and device power draw.
• Dual USB interface: includes USB input and output for simple pass-through testing.
• Plug and play operation: no external power supply or complicated setup required.
• Compact portable body: easy to carry in a repair kit, toolbox, or electronics lab.
• Useful troubleshooting tool: helps identify slow charging, weak adapters, bad cables, and unstable USB power.
• Suitable for beginners and professionals: simple enough for daily use and practical for repair diagnostics.

Technical Specifications

What This Tester Helps You Check

• USB charger output voltage during real use.
• Charging current drawn by phones, small gadgets, and USB devices.
• Power bank output stability under load.
• Charging cable quality and possible voltage drop.
• USB adapter performance compared with another adapter.
• Basic charging faults during repair and diagnostics.

Recommended Uses

• Testing mobile chargers and USB adapters.
• Checking USB charging cables before use or sale.
• Monitoring power bank output voltage and current.
• Mobile repair shop diagnostics.
• DIY electronics and USB-powered project testing.
• Checking laptop USB port output.
• Comparing charging speed between different chargers and cables.

How to Use

1. Connect the USB tester to a USB charger, power bank, laptop port, or USB power source.
2. Connect the device or USB cable to the output side of the tester.
3. Read the voltage and current values from the digital display.
4. Compare the readings with the expected charger output and the normal current draw of the connected device.
5. If the voltage drops heavily or the current is much lower than expected, check the charger, cable, or connected device.
6. Disconnect the tester after finishing the measurement.

Important Notes

• This tester is designed for USB voltage and current monitoring only.
• Do not exceed the rated voltage and current range.
• It does not repair weak chargers or damaged cables; it helps identify the issue.
• Readings may vary slightly depending on charger quality, cable resistance, and connected load.
• Not suitable for direct mains voltage testing.
• Do not expose the tester to water, high heat, or physical impact.

Package Includes

• 1 × Portable Dual USB Voltage Current Tester 3-9V 0.1-3A Digital Display

Micro Ohm Quality Note

This product is prepared with clear technical details to help technicians, makers, and everyday users test USB charging performance quickly. For best results, test chargers and cables under real load and compare readings using the same device for accurate comparison.