Specification This battery internal resistance tester is a handheld tester specifically designed for measuring the parameters of various types of batteries, such as automotive or small battery applications. The product adopts 1KHz AC low resistance measurement technology and noise reduction technology, and the Kelvin four terminal connection method is used to connect and measure, avoiding the influence of wire resistance and contact resistance, and improving testing accuracy. Automatic switching of resistance and voltage ranges; Simultaneous measurement and synchronous display of battery internal resistance and voltage. With its professional and accurate test performance, humanized design concept, nice durability, and long endurance, this battery internal resistance tester is a useful partner for battery maintenance and troubleshooting. Features: 【Professional and Accurate Testing】: This battery internal resistance tester adopts 1KHz AC low resistance measurement technology and Kelvin four-wire detection, effectively eliminating the influence of line and contact resistance, realizing high-precise internal resistance and voltage detection of various types of small batteries, such as leadacid batteries, lithium batteries, nickel-cadmium batteries, alkaline batteries, etc. It is especially suitable for testing and maintenance of automotive batteries (electric vehicles, motorcycles, traditional cars, new energy vehicles, and electric vehicles). 【Humanized Functional Design】: With a self-calibration function to ensure continuous accuracy, users can calibrate themselves according to their needs, and equipped with a filtering function and double alarm prompts, based on the preset upper and lower limits to automatically determine whether the battery's internal resistance is qualified, and through the nice, qualified, poor three-level prompts to visually display the test results. With the automatic resistance/voltage switching function, the measurement ranges from 0.000mΩ to 500.0Ω resistance and 0.000V to ±120V voltage. 【3.2-inch Display & Convenient & Comfortable Operation】: 3.2-inch display can simultaneous display the internal resistance and voltage values. The internal resistance measurement supports six automatic switches to simplify the operation process; the backlit display and LED flashlight function ensure it can operate in a dim environment. Its exquisite appearance and long-lasting design, combined with the humanized operation experience, make it a superior tool for battery testing and maintenance work. 【Quality Material & Powerful Endurance】: The housing is made of ABS material and is fully wrapped with a TPR (thermoplastic rubber) design for a comfortable grip, providing shock and drop resistant features, ensuring that the instrument can still work stably in harsh environments. Built-in a 1200mAh high-capacity lithium battery, with a short charging time of 2 hours, it can continue to work for about 8 hours, effectively protecting long uninterrupted on-site testing needs. 【Wide Applicability】: With its professional and accurate test performance, humanized design concept, nice durability, and long endurance, this battery internal resistance tester is a useful partner for battery maintenance and troubleshooting. Suitable for various battery testing scenarios such as automotive or small battery applications. Specifications: Name: Battery Internal Resistance Tester Material: ABS + TPR Model: IR500, IR502 (optional) Battery: 1 * 3.7V, 1250mAh lithium battery (included) Display: IR500 3.2inch TN black and white display, IR502 3.2inch VA color display (according to your selection) Voltage ranges: 0~±120V Internal resistance ranges: OmΩ to 500Ω Maximum input voltage: 120VDC Measuring current: 50mA to 50uAAC Measurement speed: 3 Times/Second Measure signal frequency: 1KHz Automatic/Manual selection of voltage ranges: √ Automatic/Manual selection of resistance ranges: √ Four-line Kelvin testing method: √ User self-calibration: √ Autonomous factory recovery: √ LED flashlight function: √ Automatic shutdown: √ Display size: 55 * 57mm / 2.17 * 2.24in Package size: 221 * 148 * 50mm / 8.70 * 5.83 * 1.97in Package weight: 496g / 1.09lb Packing List (IR500): 1 * Battery Internal Resistance Tester 1 * Test Cable 1 * Charging Cable 1 * Manual OR Packing List (IR502): 1 * Battery Internal Resistance Tester 1 * Test Cable 1 * Charging Cable 1 * Cloth Bag 1 * Manual Package List (IR500): 1 * Battery Internal Resistance Tester 1 * Test Cable 1 * Charging Cable 1 * Manual OR Packing List (IR502): 1 * Battery Internal Resistance Tester 1 * Test Cable 1 * Charging Cable 1 * Cloth Bag 1 * Manual