ATO air quality monitors are pocket-sized laboratories that put the chemistry of the air you breathe onto a bright 2.8-inch TFT screen in about three seconds. Inside the ABS case a high-speed ARM processor orchestrates four independent sensors: a laser-scatter module for PM1.0 / PM2.5 / PM10, an electrochemical cell for formaldehyde (HCHO), a heated MOS bead for total VOCs, plus temperature and humidity elements. The data are converted into a 0-500 Air Quality Index and updated in real time; if HCHO drifts above 0.08 mg/m³ or TVOC above 0.60 mg/m³ an audible alarm warns that ventilation or filtration is required .
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