Feature:1. Coupled with a unique accuracy algorithm, the accuracy and stability of the power tester are ensured at the hardware and software level.2. This USB C power tester supports recognizing the fast charging protocols for QC2.0/QC3.0/PD/SAMSUNG.3. The voltmeter has a poweroff storage function, thus it can store capacity and energy data when the power is off.4. With a 0.96in IPS highdefinition color liquid crystal display screen, the data is very clear for viewing.5. The practicability allows for flexible application, including smartphone, computer, portable power bank and so on.Specification:Item Type: USB C Power TesterProduct Material: ABSProduct Model: KWS-1902CColour: BlackVoltage: DC4-30VCurrent: 0-5ACapacity: 0-999999mWhLoad Resistance: 1-9999.9Voltage Resolution: 0.002VCurrent Resolution: 0.002APower: 0-150WProduct Interface: USB C 24pinDisplay Screen: 0.96in Color ScreenTest Direction: Two-waySupport: QC2.0/QC3.0Applicable Temperature: 0-80Timing: 0-99 hoursProduct Size: Approx. 55 x 26.5 x 6mm / 2.2 x 1 x 0.2inHow to Use: 1: Single short press once to change the display page;2: Quickly double-click the button to rotate the display page3: Long press the button for 3 seconds to clear all saved data;4: Charging Flow Direction Indicator: The color of the arrow and the scroll speed follow the current; Small but changes, the order of current from small to large: green, yellow, orange, red, the larger the current, the faster the scrolling speed, and the flow direction indicator will not be displayed when there is no current.5: Current and Voltage Calibration Method: You must use a standard voltage of 5.000V to press and hold the button to power on. When the "Factory setting" is displayed on the screen, you can release the button and the product will automatically calibrate.Calculation Method of Mobile Power Capacity:The mobile power supplyis fully charged and connected to KWS-1902C(data cleared first) and electrical appliances, and discharged until it stops output.Method 1: Mobile power capacity = KWS-1902C Measured mAh Data x Output Voltage + Battery Voltage + EfficiencyMethod 2: Mobile Power Capacity = KWS-1902C Measurement mWH: Battery Voltage Efficiency(General mobile power output voltage is 5V, battery voltage is 3.7V, efficiency is about 85-90%).Package List:1 x USB C Power Tester1 x User Manual