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Uesd for 2S-6S li-Po Battery Auto shift the voltage data one unit by one unit Only 8 gram weight,can take on plane Reverse connect protect Little current consume It is a very useful tool when flying outside.It can detect the Lithium Battery voltage from 1 to any ceels with an accuracy of 0.03V on a cell by cell basis. It can also indicate the total voltage in the battery pack which is very convenient for users when you want to quickly check the status of the pack(charged and ready to fly, or not).This device can be used as a hand device or you can fit one to every modelwith a small piece of double sided servo tape. Indicate the TOTAL VOLTAGE Has a LCD display monitor,Can install in Very convenient for test your battery! The clear display shows the voltage on its 3 digit LCD screen and allows you to probe up to 2 & 6 cells on your battery pack at any one time. Size : 50mm x 19.05mm x 10.07mm Display : LED Input Voltage : 0.01V-4.50V per cell Precision : 0.03V Weight : ~8g LED Voltage : Individual Display of Voltage one cell by one Empty Voltage : 3.70V/cell Full Voltage : 4.20V/cell