USB Voltage Tester, Voltmeter for Charger and Power Bank (AT-34 USB 3.0)

The AT34 USB Tester is a compact USB 3.0 digital multimeter designed to monitor real-time charging voltage, current, power, capacity, energy, and load impedance. Featuring a 0.96-inch IPS color LCD screen and a 4-digit high-precision measurement chip, it allows hardware engineers, technicians, and tech enthusiasts to evaluate USB power supplies, cables, power banks, and fast-charging performance with ease.

Features

• 0.96-Inch IPS Color Display: High-definition screen provides clear multi-parameter readings from wide viewing angles.
• USB 3.0 High-Speed Support: Compatible with USB 3.0, USB 2.0, and fast-charging pass-through protocols up to 5A current.
• Comprehensive Parameter Tracking: Displays voltage, current, power (W), accumulated capacity (mAh), energy (Wh), load equivalent impedance (Ω), and temperature.
• Offline Data Storage: Features 9 sets of data memory storage to record and compare battery capacity test results across multiple sessions.
• Thermometer Functionality: Integrated temperature sensor monitors real-time operating temperatures in both Celsius and Fahrenheit.
• Screen Off & Flip Mode: One-button operation allows screen orientation flipping for easy reading or switching off the display for overnight testing.

Description

The AT34 USB 3.0 Voltage & Current Tester is a diagnostic tool for testing USB power delivery, charger safety, and cable resistance. Engineered with a dedicated 4-digit measurement IC, this pocket-sized tester delivers precise real-time diagnostics for evaluating fast-charging wall plugs, power bank outputs, and mobile device charging rates.

By plugging the AT34 between a power source and your target device, you can instantly detect power drops, bad charging cables, or faulty power bricks. Its support for USB 3.0 ensures data lines remain uninterrupted during pass-through power testing, while internal power storage keeps accumulated mAh data safe even after power-down.

Specifications

Compatible Device & Test Use Cases

Compatible Interfaces & Protocols:

• USB 3.0 & USB 2.0 host ports (Laptops, PCs, Wall Chargers, Power Banks, Car Chargers)
• QC2.0, QC3.0, and standard USB fast-charging protocols

Primary Diagnostic Applications:

• Power Bank Capacity Testing: Measure real discharge mAh/Wh capacity to verify true battery ratings.
• Charger Output Verification: Check if fast-chargers actually output claimed wattage (W) and voltage (V).
• Cable Resistance Testing: Identify faulty or low-quality USB charging cables causing slow charging.
• Device Draw Analysis: Monitor power consumption of USB-powered devices (fans, lights, microcontrollers, external hard drives).

Frequently Asked Questions (FAQ)

1. Does the AT34 USB tester support USB 3.0 data transfer while testing?

Yes, the AT34 features full USB 3.0 pass-through, meaning high-speed data transmission between connected devices continues normally while power metrics are monitored.

2. How do I clear recorded capacity (mAh) data?

Long-press the switch button on the device to clear stored capacity and energy data for the currently selected memory group.

3. Will this tester work with USB-C chargers?

The AT34 uses standard USB-A input and output ports. To test USB Type-C chargers or cables, a USB-A to USB-C adapter or pass-through cable is required.

Why Choose This

• High Precision 4-Digit Resolution: Offers 0.001V and 0.001A resolution for accurate readings compared to standard 3-digit meters.
• Non-Volatile Data Memory: Preserves total capacity and energy readings across power disconnects.
• Compact & Lightweight: Weighs only 14 grams, making it an essential diagnostic tool for technicians and field engineers.

Safety & Usage Instructions

• Do not exceed the maximum rated voltage input of 30V DC or current load of 5A.
• Ensure secure connection into USB ports to prevent loose contact resistance heating during high-current testing.
• Keep away from liquids, high moisture, and extreme heat environments during high-wattage power testing.

Package Content

• 1 × AT34 USB 3.0 Voltage, Current & Power Tester
• 1 × Protective Storage Case / User Guide

Warranty & Return Policy

• 7-Day Easy Return or Replacement (Terms & Conditions Apply)
• Product must be returned in original condition with intact protective packaging.

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