FNIRSI® SFD-02 4-IN-1 Indoor Air Quality Monitor Touchscreen Formaldehyde Detector HCHO TVOC Tester

FNIRSI SFD-02 Formaldehyde & Air Quality Monitor The FNIRSI SFD-02 is a smart indoor air quality tester, designed to monitor formaldehyde (HCHO) and TVOC levels in real time. Ideal for homes and offices, it provides accurate, easy-to-read data and intelligent features to help keep your environment safe and healthy. Instantly displays formaldehyde, TVOC, humidity, and time — know your air quality at a glance.