Features: ◆ Complies with regulations: Hourly average recording and 8-hour average display. ◆ Convenient management: Web interface for monitoring on local area network or Internet without the need for an APP. ◆ Complete control interface: Switching equipment and controlling air damper opening. ◆ Simple calibration: One-button operation. ◆ Convenient maintenance: LED/sensor can be hot-swapped and replaced. ◆ Capable of measuring temperature, humidity, CO2, PM2.5, formaldehyde, and CO simultaneously. ◆ Global rapid upgrade function. ◆ USB recording function, with 30-second data download and 60-second trend chart download via web, achieving paperless management worldwide. [Application places]: IAQ public space display, laboratory, office, station, airport, museum, art gallery.