Features 1、Battery Resistance Tester: Unique and accurate motion measurement design with 1KHz AC low resistance measurement technology and noise reduction technology, no disconnection required for measurement while the tested object is running, and four wire testing connection. 2、Automated Battery Analyzer: Voltage range of 0.00V‑±120V, internal resistance range of 0.000mΩ‑500Ω, with six auto switching resistance ranges. One device covers measurements for all batteries from 0‑3000AH without the need for multiple devices. 3、Large Screen LCD Display: Equipped with a 3.2inch 55x57mm TN HD LCD screen, making it easy to read with automatic switching of resistance and voltage ranges. 4、ABS Materials: Made of TPR (thermoplastic rubber) and ABS, environmentally friendly and robust. Thickened materials provide increased drop and pressure resistance, enhancing the lifespan by 300%. 5、User Friendly Design: No need to distinguish between positive and negative terminal when using the battery tester, simply plug and play. Comes with a universal DB9 interface design for easy connection to various battery test equipment. Specification Item Type: Battery Resistance Tester Material: ABS Voltage: 0.00V - ±120V Internal Resistance Measurement: 0.000mΩ - 500Ω Maximum Input Voltage: DC120V (non polarized), do not input AC Measurement Current: 50mA - 50uAAC Measurement Speed: 3 seconds/time Measurement Signal Frequency: 1KHz Voltage Range Selection: Auto, Manual selection Internal Resistance Range Selection: Auto, Manual selection Self Connection Optional: Yes Measurement Method: Four wire test method User Self Calibration: Yes Self Manufacturing Factory Reset: Yes Battery Selection Standard: Acid battery, lithium battery, ni cadmium battery, alkaline battery Screen and Size: Approx. 55 x 57mm / 2.17 x 2.24in TN black and white screen Power Supply: 1 x lithium ion battery 1250mAh (built in) Battery Model: N A Charging Voltage: DC5V Lighting Function: Yes Other Features: Low voltage detection, white backlit, automatic shutdown Package List 1 x Tester 1 x Testing Wire 1 x Charging Cable 1 x Storage Bag 1 x Storage Box 1 x User Manual