The AT34 uses a 0.96-inch IPS high-definition color LCD screen to display the device's charge status, voltage, current, capacity, energy, power, equivalent impedance, temperature and other indicators at a glance. 160 degree wide viewing angle, high brightness and long service life. Voltage: 3.7-30 V; Running: 0-4A. Fast charge recognition, widely compatible. Support QC2.0, QC3.0, APPLE 2.4A / 2.1A / 1A / 0.5A, Andriod DCP protocols, SAM-SUNG charging protocol identification, let you know the charging status of the phone. 5-bit resolution for more precise measurements. The screen can be turned off with a button and has an inverted screen function. Thermometer function using high precision thermistor sensor, Celsius and Fahrenheit-free switching. AT35 has power-off storage function, capable of storing capacity and energy data when the mobile is turned off, which is convenient for later visualization and measurement of the energy capacity of mobile power.Note: Other USB testers which do not have the power-off storage function cannot test the capacity and energy. Measure the quality of the charger: connect the same load, compare the no-load load and the load, the greater the voltage drop, the poorer the capacity of the charger, the better the quality; voltage drop is not obvious or voltage rises, charger charging capacity and quality are better. Measuring voltage: 3.70-30.00v Measuring current: 0-4.000A Capacity measurement range: o-9999mAh Energy measurement range: 0-9999mWh-999.99wh Load impedance measurement range: 1o-9999.9o Temperature measurement range: 0 ℃ ~ 80 ℃ / 32F ~ 176F Operating temperature range: 0 ° C ~ 45 ° C / 32 ° F ~ 113F Product size: 64mmx22mmx12mm Display screen: 0.96 inch color LCD screen Voltage measurement resolution: 0.01 V Current measurement resolution: 0.001 A Voltage measurement accuracy: (0.8% + 4 words) to 25 Current measurement accuracy: ± (1% + 4 words) @ ​​25 ℃ Power measurement range: 0-120w Temperature measurement error: + 3C / ± 6 ° F Refresh rate: 2 Hz Product weight: 14g Package including 1 * AT34 USB tester Note: it does not include other things, the color is based on the first picture, and the other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!