Features: measurement range: 120V battery voltage, 500 battery internal resistance measurement and can test more types of batteries, including lead-acid batteries, lithium batteries, nickel-cadmium batteries, alkaline batteries, etc. 6 Resistance Range Automatic Switching function, which can automatically adapt to the resistance range of different batteries, making it convenient for users to test. 3.2 Large-screen: it can display the main and secondary dual-digit readings at the same time, allowing users to understand the test results more clearly. It has user self-calibration function to high precision and accuracy of test results. The device is equipped with a backlight display and LED flashlight lighting function, allowing users to operate easily in dim environments. Powered by 1200mAH lithium battery, it is economical, environmentally friendly and practical, providing users with long-term use and convenience. Specifications: Voltage:0.00V~120V Internal Resistance Measurement:0.000m~500 Maximum Input Voltage:DC120V (non polarized), cannot input AC Measuring Current:50mA~50uA AC Measurement Speed:3 times/second Measure Signal Frequency:1KHz Voltage Range Selection:Automatic/manual selection Selection Of Internal Resistance Range:Automatic/manual selection Autonomous Connection Optional: Measuring :Four line Kelvin testing User Self Calibration: Autonomous Factory Recovery: Battery Selection Criteria:Lead acid batteries, lithium batteries, nickelcadmium batteries, alkaline batteries, etc Lighting Function: Other Functions:Low voltage detection, white backlight automatic shutdown Material: ABS Color: as shown Package Contents: 1 x IR502 Battery Tester 1 X English User Manual 1 x Charging Cable 1 x Detection cable 1 x Storage Cloth Bag Only the above package content, other products are not included. Note: Light reflection 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.