The Battery Internal Resistance Tester is a versatile and essential tool for measuring both battery internal resistance and voltage simultaneously. It features a four-wire test clamp system to minimize the effects of contact and wire resistance, ensuring precise measurements. Whether for routine maintenance, scientific research, or battery production, this tester is a reliable choice. Features: Simultaneous measurement of battery internal resistance and voltage. Equipped with intelligent control, LCD display, and Kalman filter algorithm for enhanced efficiency and energy savings. Widely applicable for use in various industries including battery production, testing, and scientific research laboratories. It is also suitable for measuring AC resistance in resistors and low-resistance precision applications. Built-in 1000mAh rechargeable lithium battery for extended use. Compact and portable, easy to carry for on-the-go usage. Includes serial port communication with a baud rate of 115200 for computer connectivity. Offers free, powerful computer analysis software; communication needs to be enabled on the device. Specifications: Material: ABS Available Types: 3 options (Tester+probe, Tester+clip, Tester+probe+clip) Battery: 1 lithium battery, 1000mAh (included) Measurement Speed: 5 readings per second Adjustment: Correction available for resistance and voltage independently Basic Accuracy: Resistance: 0.5% Voltage: 0.5% Measuring Ranges: Resistance: 1μΩ to 200Ω Voltage: 1mV to ±100V DC Test Signal Frequency: AC 1KHz Test Signal Current: 20mΩ: 50mA 200mΩ: 5mA 20Ω: 0.5mA Resistance and Voltage Ranges: 6 resistance and 3 voltage ranges, both automatic and manual Display Update: Refreshes 5 times per second Auto Shutdown: Powers off automatically after 10 minutes of inactivity Language Options: Switchable between Chinese and English Item Size: 171 x 80 x 29mm (6.73 x 3.15 x 1.14 inches) Package Size: 180 x 90 x 35mm (7.09 x 3.54 x 1.38 inches) Package Weight: 330g (11.64 ounces) Packing List: Type 1: 1 Tester 1 Probe OR Type 2: 1 Tester 1 Clip OR Type 3: 1 Tester 1 Probe 1 Clip