Features: Double channel battery internal resistance tester delivers precise capacity and resistance measurements for two cells simultaneously, featuring auto cycling support for up to 9 charging discharge cycles in automatic mode. independently channel operations allows customized settings for each 18650 or flat cell test, paired with robust spring loaded clamps and a compact battery holder for secure connection. Ideal for electronics engineers, battery maintenance technicians, and diyer enthusiasts requiring professional diagnostics for lithium ion cells, power banks, or rechargeable battery packs. Optimized for lab environments, repair workshops, or home stations to evaluate battery health, troubleshoot performances issues, or verify recycled cell viability with lab accuracy. Equipped with advanced charging ICs for controlled 1A maximumly current input, auto termination at 4.2V cutoff voltages, and 0.1A trickles charging detection to prevent overcharging risks during testing cycles. Specifications: Working voltages: DC5V Stop discharge voltages: 2.5V, 2.6V, 2.7V, 2.8V, 2.9V, 3.0V, 3.1V, 3.2V, 3.3V, 3.4V, 3.5V, a total of 11 levels adjustable Product Size Approx.190x50x27mm/7.48x1.96x1.06inch Component:Plastic Package Includes: 1pcs Battery Internal Resistance Tester note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.