The battery internal resistance tester can measure the battery internal resistance and voltage at the time.Wide applications: This product is widely used in 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- resistance.This tester adopts intelligent control and display, also with -in 1000mAh lithium battery to 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 .This product supports serial ports, and the measuring ranges of resisitance is 0.0001m~200, and the measuring ranges of voltage is 0.0001V~100V direct current.Style: CMaterial:plasticcolour:YellowPackage Contents:1 * Tester1 * FixtureOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.