For the most accurate readings, the device should be placed where mold is most likely to grow. The most vulnerable areas are often the coldest and least ventilated.
Good. Little risk for mold growth, but there is always a possibility for mold above 0.
Fair. Mold will grow especially on vulnerable materials such as textiles and wood.
Poor. There is a high mold risk for all kinds of materials.
The mold risk indicator will not detect actual mold spores in the air. However, it will tell you when the conditions in a space are at risk for mold growth. This means it is a great device to use to prevent mold or to proactively watch out for the chance of mold. However, once mold has started growing and is visible, it should always be removed. This can be easily done on your own. If you are unsure if what you are seeing is mold, then use a mold test kit or contact a mold professional.
The mold risk sensor uses an algorithm based on the temperature and humidity sensor to measure how fast mold can grow under the current conditions. Since the material where mold is growing is an important condition to the speed of mold growth, we have assumed the more vulnerable materials in our equation: wood and textiles. Therefore, if your device is showing yellow in an all tile bathroom, there is less chance of mold growth.
We have used the criteria for moisture control in buildings based on ASHRAE standards (a global society advancing human well-being through sustainable technology for all buildings). Their mold index scale is from 0 (no mold) to 6 (full mold growth population) and it takes into account material types to describe the total accumulated mold after a certain time. We base our indicator on the rate change of the mold index: 0 means declining index, while 10 means maximum increase to the index.