WireCutter (since bought by the NY Times) literally has an article on this subject. https://www.nytimes.com/wirecutter/reviews/best-home-air-quality-monitor/ h

WireCutter (since bought by the NY Times) literally has an article on this subject. https://www.nytimes.com/wirecutter/reviews/best-home-air-quality-monitor/ https://www.nytimes.com/wirecutter/reviews/best-home-air-qua... I bought one of their prior recommendations, the "Kaiterra Laser Egg+ Chemical", and as far as I could tell it did the "TVOC-to-CO2" lookup table conversion mentioned in this article, and so it would give CO2 readings that were inconsistent with same-branded CO2 sensor ("Kaiterra Laser Egg+ CO2"). WireCutter seem to have since updated the recommendation to something with a different type of sensor.