The battery internal resistance tester can measure the battery internal resistance and voltage at the same time, this tool using four-wire test clamp, can better avert the influence of contact resistance and wire resistance, can carry out more accurate measurement. This tool is an indispensable tool in your daily maintenance, come and have a try, it will not let you down. Features: The battery internal resistance tester can measure the battery internal resistance and voltage at the same time. Wide applications: This product is widely used in various battery production, maintenance, testing, scientific research laboratories and other occasions. It can also be used to measure the AC resistance of resistors and low-resistance high-precision resistance. This tester adopts intelligent control and large display, also with built-in 1000mAh lithium battery to provide long service time, you can recharge it in time. Portable size and easy to carry, you can take it with you to anywhere you want to use. This product supports serial ports, and the measuring ranges of resisitance  is 0.0001mΩ~200Ω, and the measuring ranges of voltage is 0.0001V~±100V direct current. Specifications: Material: ABS Type: Type1: Tester+probe Type2: Tester+clip Type3: Tester+fixture Speed: 5 times/second Adjustment: Correction for resistance and voltage separately Basic accurancy: Resistance: 0.5% Voltage: 0.5% Measuring ranges: Resistance: 0.0001mΩ~200Ω Voltage: 0.0001V~±100V direct current Resistance ranges: 6 ranges automatic and manual Voltage ranges: 3 ranges automatic and manual Battery: 1 * lithium battery, 1000mAh (included) Package size: 180 * 90 * 35mm / 7.1 * 3.5 * 1.4in Package weight: 250g / 8.8ounce Packing list: Type1: 1 * Tester 1 * Probe or Type2: 1 * Tester 1 * Clip or Type3: 1 * Tester 1 * Fixture