It may happen that two air-Qs located in the same room show different readings for some sensors. This indicates that the calibration of the sensor modules is different.
Cause: The devices were probably previously in different environments or were not running continuously. This led to the fact that the continuous automatic calibration in the air-Q could not yet be completed. In general, air-Q should be regularly in a fixed location so that the (electrochemical) sensors can adjust to the individual room climatic conditions.
Solution: After the automatic calibration is complete, the readings of the air-Qs will align.
In certain cases, it may be necessary to perform a manual calibration – e.g. if the automatic calibration cannot be completed or is taking too long. The reason for this is that the air in the room is constantly too polluted (the indicator here is the VOC value, which should regularly fall below 700 ppb).
Special case VOC sensor: The VOC sensor is a sum value for various substances (over 100 substances and chemicals in total). The VOC sensor in the air-Q is calibrated to ethanol.
It can happen that the measurements from two VOC sensors are output differently. This is due to different sensitivities that the VOC sensors have to different substances (besides the ethanol that is calibrated equally). In practice, the air always consists of a gas mixture. Therefore, the output measurements from two VOC sensors often deviate from each other.
If you find the differences disruptive, you can adjust the two measurements. Use the calibration function in the smartphone app and settings [gear icon on the dashboard] -> Sensors -> Calibration. Calibrate the higher displayed value to the lower VOC measurement of the second air-Q.
Related Article: How do I perform a manual calibration?