... Vlow-voltage prompts ,error+,-0.2v.10.Correction mode,while holding down the on\off button ... boot mode,when the shows"cal"thatenter the correction mode,and display the code value of ... ,press the mode button calibration zeropoint, zero correction successful show"0",100 weight placed,press the ... mode button to confirm correction.External calibration,long press mode buttoto enter the ...