When connecting power to the unit or when the unit is powered on do not HOLD the function button.
Holding the Function button will reset the voltage calibration. To set voltage calibration again professional knowledge and equipment is required.
Voltage calibration: click here
The MC-6S is an easy to use, compact 6S Cell Checker with built in receiver and satellite checking function. Simply connect the balance lead from you LiPO/LiFE battery to the balance plug pins to get an instant read out of your batteries cell voltage.