How do I buy a new sensor replacement cartridge?

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• Product Downloads
• What happens if I use my sensor while I have a humidifier on? 
• Do I need to clean my sensor?
• How do I buy a new sensor replacement cartridge?
• How often do I need to change the sensor cartridges?
• How sensitive are the sensors?
• Does the sensor detect pollutants in real time?
• What contaminates and comfort factors does the sensor monitor?
• How do I turn on the air quality sensor?
• How do I install the surface mounted air quality sensor?