Negative Positive
Title: Collosal waste of time.
Review: I knew this product had mixed reviews but this unit is classified as defective. Measurement starts in basement after 2 days as 2.1, then climbs over a week to 4.0. I open the windows for 24 hours and the reading drops to 3.9. Then I move it to the 2nd floor and get a reading of 3.1 and it never changes despite windows being open and closed, ventilation system being on, etc. Finally one last attempt I put it outside on a covered porch, so it should be read .4 which is avg outdoor. Nope stays at 3.1 for 48 hours.Not sure what this device does but clearly mine is defective.I will use the carbon tests and double check with a pro.
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