When you insert the batteries in the 'Home' for the first time, or you press the reset button, the device will perform a calibration (the display will show "calibrating" for a few seconds).

You do not have to do the calibration in the same room as you measure

However, we always recommend starting a new measurement whenever you move the device to a new room so that the long-term average is not impacted by data from another room. To start a new measurement simply press the reset button or take out the batteries and re-insert them.

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