Feature: 1. Accurate Testing: This automatic battery analyzer adopts 1KHz AC low resistance measurement technology and Kelvin 4 wire detection, which effectively eliminates the influence of line and contact resistance, and realises high accuracy resistance and voltage testing of all kinds of small batteries, such as acid batteries, lithium batteries, Ni Cd batteries, alkaline batteries and so on. 2. Multifunctional: This car battery tester has a self calibration function to ensure continuous accuracy, users can calibrate themselves according to the need, and equipped with filtering function and double alarm prompts, according to the preset upper and lower limits to automatically determine whether the battery internal resistance is qualified or not, and intuitively displays the test results through the good, qualified, and poor 3 levels of prompts. Also has automatic resistance or voltage switching function, the measurement range is 0.000mΩ to 500.0Ω resistance and 0.000V to ±120V voltage. 3. 3.2 Inch Display: This battery internal resistance tester features a 3.2 inch display that shows both internal resistance and voltage values. The backlit display and LED torch feature ensure that it can operate in dimly lit environments. 4. Easy To Operate: The battery internal resistance Tester of this tester supports 6 kinds of automatic switching to simplify the operation process, and the operation is very convenient and comfortable. 5. Built In 1200mAh Lithium Battery: This automatic battery analyzer has a built in 1200mAh high capacity lithium battery, which can work continuously for about 8 hours with a short time charging of 2 hours, effectively guaranteeing a long time and uninterrupted on site testing needs. The full wrap around TPR (thermoplastic rubber) design provides a comfortable grip and offers shock and drop resistance. Specification: Item Type: Battery Internal Resistance Tester Material: ABS Voltage: 0.00V-±120V Internal Resistance Measurement: 0.000mΩ-500Ω Maximum Input Voltage: DC120V (No Polarity), No AC Input Measurement Current: 50mA-50uAAC Measurement Speed: 3 seconds/time Measurement Signal Frequency: 1KHz Voltage Range Selection: Auto, Manual Internal Resistance Range Selection: Auto, Manual Self Connection Optional: Yes Measurement Method: 4 Wires Kelvin Testing Method User Self Calibration: Yes Factory Reset: Yes Battery Selection Standard: Acid Battery, Lithium Battery, Ni Cd Battery, Alkaline Battery Screen Size: Approx. 55 x 57mm / 2.17 x 2.24in TN Color Screen Power Supply: 1 Lithium Ion Battery 1250mAh (Built In) Charging Voltage: DC5V Lighting Function: Yes Other Functions: Low Voltage Detection, White Backlight, Auto Shutdown. Package List: 1 x Battery Resistance Tester 1 x Test Cable 1 x Charging Cable 1 x Storage Bag 1 x Storage Box 1 x Manual