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 display, also with built-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 to use. This product supports serial ports, and the measuring ranges of resisitanceis 0.0001mohm-200ohm, and the measuring ranges of voltage is 0.0001V-100V direct current. Speed:5 /second Adjustment:Correction for resistance and voltage separately Basic accurancy: Resistance:0.5% Voltage:0.5% Measuring ranges: Resistance:0.0001mohm-200ohm 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) Type:A Colour:As Shown Material:plastic+metal Package Contents: 1 * Tester 1 * Probe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.