The battery internal resistance tester can measure the battery internal resistance and voltage at the same time. This product adopts intelligent control, LCD display, and implanting Kalman filter mathematical algorithm, with high efficiency, low cost, light weight and energy saving. 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- 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 resistance is 1μΩ~200Ω, and the measuring ranges of voltage is 0.0001V~±100V direct current. Added serial port communication function, free powerful computer analysis software. Serial port needs to be opened in the machine to be to communicate with the computer, the default is closed, the baud rate is 115200. Battery: 1 * lithium battery, 1000mAh (included) Speed: 5 times/second Adjustment: Correction for resistance and voltage separately Basic accuracy: Resistance: 0.5% Voltage: 0.5% Measuring ranges: Resistance: 1μΩ~200Ω Voltage: 1mV~±100V direct current frequency: AC 1KHz current: 20mΩ, 50mA; 200mΩ, 5mA; 20Ω, 0.5mA Resistance ranges: 6 ranges automatic and manual Voltage ranges: 3 ranges automatic and manual Display update: 5 times / second (The actual product has the words "battery internal resistance tester", which does not affect its use) Color: Orange Material: ABS Package Contents: 1 * battery resistance meter 1 * probe 1 * Kelvin clip 1 * battery holder 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.