Uses a 0.96 inch IPS high-definition color LCD screen to show charging status, voltage, current, capacity, energy, power, equivalent impedance, temperature, etc. 160 degree wide viewing angle, high brightness and long service life. Quick charge identification, widely compatible: AT34 supports QC2.0, QC3.0, i Phone 2.4A/2.1A/1A/0.5A, Andriod DCP, quick charge protocol identification, let you know the charging status of the phone. a power-off storage function that stores capacity and energy data when the mobile is powered off, which facilitates later viewing and facilitates measurement of the energy capacity of the mobile power source. Note: Other USB testers that do not have a power-saving storage function cannot test capacity and power. 4-bit precision for more accurate measurements; measurement of impedance and power equivalent to the load; thermometer function, Celsius and Fahrenheit free switching: using high precision thermistor sensor; USB 3.0 interface: USB 2.0 compatible, support high current test, support USB3.0 interface mobile hard disk and U disk test. Measure charger quality: connect the same load, compare the no-load charging and charging, the greater the voltage drop, the worse the capacity of the charger, the worse the quality; the voltage drop is not obvious or the voltage increases Note: The data are all manual measurement, please allow 1-3cm error, due to the difference of light and display, there will be some color difference, depending on the physical item received.