6. It is suggested to calibrate the detector after three months usages.
Please follow the manual instructions showing below:
a) Turn ON the detector and wait for about 10 minutes.
b) Use the pin to poke the calibration button until HCHO icon blinks on the
screen.
c) Place the detector outside for 10 minutes for ventilation.
d) When HCHO icon does not blink, it indicates that the calibration has
finished.
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