The humidistat is situated at the bottom of the machine. It reads the humidity level of the air surrounding the botom of the unit - thus depending on air circulation of the surrounding, there will be instances where readings will rise and fall.

We recommend that the unit be placed on an elevated location i.e. desk or table, as air circulation is better. Please refrain from placing the unit in a closed area as condensation may form and wet/damage the surface around.