Yes, the tester’s readings are affected by temperature and humidity, and can vary greatly. We have an article about formaldehyde and VOC testers for your reference: https://smartairfilters.com/en/blog/3-things-you-need-to-know-about-formaldehyde-part-one/ ? rel = 1
Will the Data Measured With the Formaldehyde Tester Be Easily Affected?
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