Tenergy 5-in-1 Cell Meter has 5 main functions: capacity checker, battery balancer, battery discharger, battery internal resistance tester, and ESC/Servo PPM tester. <br> <br> <b>Battery Capacity Checker</b> <br> Tenergy 5-in-1 Cell Meter can display the estimated capacity and voltage for LiPo / LiFePO4 / Li-ion / NiCd / NiMH battery packs. Use this function to quickly check if your battery requires charging before use. For LiPo/LiFePO4/Li-ion packs, it can also display the voltage of each cell, so you know when they need to be balanced. <br> <br> <b>Battery Balancer:</b> <br> Optimize your battery’s performance, and extend the overall lifespan, by ensuring the individual cells are balanced. <br> <br> <b>Battery Discharger:</b> <br> Discharging your battery prior to changing can improve the runtime of your battery. Tenergy 5-in-1 Cell Meter can discharge lithium-based battery packs to an adjustable threshold, at the discharge rate of 180mA. <br> <br> <b>Battery Internal Resistance Tester:</b> <br> For lithium-based battery packs, this cell meter can display the internal resistance of each individual cell, so you can evaluate the health of your battery pack and decide when to discard or replace it. <br> <br> <b>ESC/SERVO PPM Tester:</b> <br> Supply a reliable PPM signal to test and adjust your servo motors. <br> <br>*Note: A Y-harness and 4.8V-6V NiMH battery (not included) is needed to support ESC/Servo function.<br><BR> <b>Package includes</b> <br> 1 x 01444 Tenergy 5-in-1 Cell Meter for LiPo / LiFePO4 / Li-ion / NiCd / NiMH Battery Packs <br> 1 x User manual