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Mill Sense

Good indoor air quality is a prerequisite for good health. Mill Sense keeps you continually informed and up to date on your household’s indoor air quality and climate. Whether on the go or in your home, you can ensure healthy indoor conditions for you and your family.
Neat and elegant, Mill Sense looks just as good on your table as it does on your wall. The sensor can be placed freestanding or hung with the included wall bracket. Easy mounting with an adhesive backside of the wall bracket means that you do not have to use screws or tools. Mill Sense is rechargeable with it’s included USB cable type C. Connect Mill Sense to your Mill WiFi heaters for a more precise temperature control as a sensor that is separate from the heater will provide an even more accurate value since it measures room temperatures away from the direct heating element. And as air quality can also vary considerably between rooms, Mill Sense is also available in a 3-pack at a fair price.

At a glance

WiFi + App control
Meaures toxins and chemicals
Precise temperature control
Measures humidity levels
Ensure fresh air
5 year warranty
Premium quality


Simple steps may improve your indoor air quality, with the first step becoming aware of possible issues and understanding what needs to be improved.


Excessive humidity levels can cause mold growth and lead to asthma and allergies. Good indoor ventilation is therefore especially crucial when taking a shower, drying of clothes and /or cooking. Dry air can also be problematic, particularly during the wintertime. This can result in home damages, such as creaking or cracking of wooden floors and furniture. Due to new construction techniques, the relative indoor humidity often drops below the recommended values in new houses, this partly being due to good insulation. A humidifier / dehumidifier, for example, can be a solution to achieve a recommended humidity level in the home. The recommended level of humidity: 30-60%. Max Accuracy: Relative humidity sensor ±2.0% RH


Total Volatile Organic Compounds (TVOC) are airborne chemicals & toxins emitted from everyday items such as paint, furniture, and cleaning products. They can be harmful at a high concentration, causing irritations in eyes, nose, and throat. Depending on the level and length of exposure TVOCs can also cause more serious health damage to liver and kidneys. Mill Sense measures the following TVOC’s: Alcohols, Aldehydes, Ketones, Organic Acids, Amines, Aliphatic and Aromatic Hydrocarbons. Recommended TVOC level: < 220 ppb. An air purifier, for example, will be able to ensure that the TVOC level is within the recommended level.


A healthy indoor climate begins with temperature consistency. Indoor temperature affects health (such as illness prevention / respiratory infections), performance and general comfort level. It is not recommended to turn indoor heating completely off in rooms not being used either, as in combination with humidity can result in mold growth. Connect Mill Sense to Mill WiFi heaters for more precise temperature control, for example. Stable, comfortable temperatures can be personalized and adjusted to daily routines. Recommended temperature: 18-25°C. Max Accuracy: Temperature sensor ±0.15°C


eCO2 refers to the estimated concentration level of carbon dioxide (CO2) in the air. Moderate to high levels of CO2 can cause headaches and fatigue, and higher concentrations can produce nausea, dizziness, and vomiting. The eCO2 measurement is calculated from the VOC measurement – if there are substantial concentrations of VOCs present, a eCO2 reading will be higher than the actual CO2 level. Good ventilation and regular ventilation are important to maintain a recommended eCO2 level. Recommended eCO2 level: <1200 ppm.

Product images


Other features

Press the button on the Mill Sense device to understand your air quality levels:


It is cold in the room, temperature is below 18°C.


Indoor air quality is good and the sensor values are within recommended level.


Indoor air quality is approaching poor/moderate levels. Take simple steps such as opening windows to bring fresh air inside.


One or more of the sensor values are above the recommended level. Actions should be taken to either increase ventilation, dehumidifying or humidifying, depending on what levels needs to be addressed.

Other features:

  • Integrated WiFi
  • User-friendly Mill app
  • Wireless
  • Rechargeable
  • Color: White
  • Operating temperatures: 5-35 degrees Celsius
  • Rechargeable: battery time approx. 6 months (USB cable type C included)
  • Product size (W x D x H cm): 7.0 x 3.0 x 7.0.
  • Model name: SENSE


Interested in Mill Sense?