Features: Brand new and high quality Accurate Internal Resistance Detection Evaluate the condition of 18650 batteries with precisions. User Friendly Designs Simply connect the battery to display the internal resistance value. Suitable for Various Users Perfect for electronic enthusiasts, battery maintenance personnel, and engineers. Versatile Applications Great for testing and assessing 18650 battery functionality in homes, workshops, and other settings. Fast and Reliable Results Obtain quick and reliable measurement readings using high sensitivity probes. Specifications: Size: approx 188×50×36mm/7x2x1.4inch Voltage: DC5V Port: Type-C Test quantity: 2 charging and discharging measurements Internal resistance measurement: supported, using DCtwo wire methods to test internal resistance Charging function: supported, automatically cut off charging when fully charges (not supported for lithiums iron phosphate battery charging) Discharge function: supported, automatically stops when conditions are meet, and the discharge current is not adjustable Automatic charging and discharging: supported, the battery is fully charges when the automatic modes ends Cyclic charging and discharging: supported, adjustable for 1-9 cycles (only supported in automatic modes) Statusprompt: Supported Heat dissipation method: active fan cooling Overheats protections: supported Stop discharge voltage: 11 adjustable levels, including 2.5V, 2.6Voltage, 2.7V, 2.8V, 2.9V, 3.0V, 3.1V, 3.2V, 3.3V, 3.4V, and 3.5V Discharge current: maximums of about 1A non constant current, not adjustable, does not support independent modification Package Includes: 1xBattery Resistance Tester note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the difference between different monitors, the picture may not reflect the actual color of the item.