The AT34 uses a IPS high-definition color LCD display to display the state of charge of the appliance, voltage, current, capacity, energy, power, equivalent impedance, temperature and other indicators at a glance. 160 degree wide viewing angle, high brightness and long working life. AT34: Fast charge recognition, widely compatible; 4-bit accuracy for more accurate measurements; Power-off storage, data is guaranteed; Thermometer function, Celsius and Fahrenheit free switching; Measure the quality of the charger; USB 3.0 interface: Compatible with USB 2.0, support high current test, support USB3.0 interface mobile hard disk and U disk test. LD35: Heat dispatch : Hydraulic bearing intelligent temperature control fan + All heat sink; Provide 4A, 25V, 35W (3 values are not exceeded) constant current test discharge task. LD35:Adjustable potentiometer: Precision multiloop adjustable potentiometer; Display mode: 4 bit LED tube; Expansion port: Micro USB port, Type-C port;LD35 Upgrade function:Display upgrade; Protection upgrade; Interface upgrade; Cooling upgrade; Precision multi-turn potentiometer; Hydraulic bearing intelligent temperature control fan. Technical Parameters: AT34: Measuring voltage: 3.7-30V Measuring current: 0-4A Capacity measurement range: 0-99999mAh Energy measurement range: 0-99999mAh-999.99Wh Load impedance measurement range: 1 ohm-9999.9 ohm Temperature measurement range: 0 Celsius-80 Celsius / 32 Fahrenheit -176 Fahrenheit Operating temperature range: 0 Celsius-45 Celsius / 32 Fahrenheit-113 Fahrenheit LD35: Rated operational voltage: DC4-25.0V Max discharging power: 35W Rated operational current: 0.25-5.0A (when fan dont work, the minimum constant current is 0.05A ) Fan Speed: Hydraulic bearing intelligent temperature control fan, speed 800010%RPM AT34: USB 3.0 interface: Compatible with USB 2.0, support high current test, support USB3.0 interface mobile hard disk and U disk test. LD35: It is suitable for measuring the output current capability of the charger, using the bulk aging test of the charger factory, and measuring the quality of the Micro-USB charging cable and the Type-C charging cable. This product is not reverse polarity protection, the input polarity can not be reversed, otherwise the product is permanently damaged and cannot be repaired colour:Black Material:plastic size:5.3*2.6*1.2CM Display:0.96 inch Package Contents: 1*Type-C Tester Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.