AT34 USB 3.0 Tester Power Meter 3.7-30V 0-4A Voltage USB Tester Multimeter Feature: The AT34 utilizes a 0.96-inch IPS high-definition color LCD screen to display the charging status, voltage, current, capacity, energy, power, equivalent impedance, temperature, and other indicators at a glance. Enjoy a wide 160-degree viewing angle, high brightness, and long lifespan. Fast charging recognition, widely compatible: The AT34 supports QC2.0, QC3.0, iPhone 2.4A/2.1A/1A/0.5A, Andriod DCP fast charging protocol identification, keeping you informed of your phone's charging status. Power-off storage ensures data integrity: The AT34 features a power-off storage function, which can store capacity and energy data when the power is off, making it convenient for subsequent viewing and power capacity/energy measurement. Note: Other USB testers without a power-off function cannot test capacity and energy. Measure charger quality: Connect the same load, compare idle and load states. The greater the voltage drop, the worse the charger's capacity and quality. A negligible voltage drop or voltage increase (compensation function) indicates better charger capacity and quality. Benefit from 4-bit accuracy for more precise measurements. Measure load equivalent impedance and power. Thermometer function with Celsius and Fahrenheit free switching: Employs a high-precision thermistor sensor. USB 3.0 interface: Compatible with USB 2.0, supports high current testing, and supports USB3.0 interface mobile hard drive and U-disk testing. Function: Model: AT34 Measuring voltage: 3.70-30.00V Measuring current: 0-4.000A Capacity measuring range: 0-99999mAh Energy measuring range: 0-99999mWh-9999Wh Load impedance measuring range: 1 - 9999.9 Ω Temperature measuring range: 0 ~ 80 ℃ / 32 ℉ ~ 176 ℉ Working temperature range: 0 ~ 45 ℃ / 32 ℉ ~ 113 ℉ Display screen: 0.96 inch color display Voltage measuring resolution: 0.01V Current measuring resolution: 0.001A Measurement accuracy: ±(0.8%+4 words) Power measuring range: 0-120W Temperature measurement error: ±3℃/±6℉ Refresh rate: 2Hz Package includes: 1X USB 3.0 Tester Power Meter (IUXUANX)