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-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 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 able to communicate with the computer, the default is closed, the baud rate is 115200. Battery: 1 x 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 Test signal frequency: AC 1KHz Test signal 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 Auto shutdown: 10 minutes delay, automatic shutdown without any operation Language: Chinese and English can be switched at will Item size: 171 X 80 X