As you can see, I use air purifiers. This is good when you need to look for airborne particles. Let's see if it's normal, maybe not without an air filter. Also checks the function of the air filter. Would buy again if needed.
π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
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π Dioxide Controller for Digital Gas Monitoring
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Car seat JUNION Ebby group 0+/1/2/3 (0-36 kg), Isofix, dark gray
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