FNIRSI 4-in-1 indoor air quality monitor HCHO TVOC AQI SFD-02

The FNIRSI SFD-02 is a compact indoor air quality monitor that measures formaldehyde (HCHO), TVOC, humidity and the air quality index (AQI) in real time. It suits homes, offices and cars, as well as newly renovated or rented apartments, where volatile compounds may be released by furniture, paints, adhesives or cleaning products.

The formaldehyde sensor uses an electrochemical design built for selective detection. An active intake system ensures a steady airflow to the sensors, so readings remain consistent wherever the device is placed. The 2.4-inch HD touchscreen clearly displays pollutant levels, humidity, air quality rating, date, time and battery status.

An audible alert sounds when levels exceed safe thresholds, and special settings can be adjusted for children, pregnant women and older people. In sleep mode, an expression on the screen reflects air quality, while a built-in formaldehyde removal calculator helps plan ventilation or purification. The 1000 mAh battery and docking station make it easy to move between rooms.