1. Comprehensive Air Quality Detection: This air quality detector is a 15-in-1 device that measures AQI, CO, CO2, PM0.3, PM1.0, PM2.5, PM10, formaldehyde (HCHO), TVOC, temperature, and humidity. It also features time display, alarms, timers, and countdown functions, providing a complete solution for your air quality needs.2. TFT Color Display and App Control: The indoor air quality monitor comes with a 2.8-inch TFT color screen, allowing you to see the test data at a glance. With the app, you can enjoy real-time air quality monitoring and remote management from anywhere.3. Settings and Historical Data Review: The portable aqi pm0.3 pm1.0 pm2.5 pm10 tester supports alarm limits, sleep mode settings, and detailed historical data exploration (by day, month, or year). The app offers a user-friendly interface with temperature unit switching and multifunctional timer settings for a personalized and convenient experience.4. Alerts and Visual Warnings: Connect the household co co2 tvoc hcho tester to WiFi and set alarm values as needed. When measurements exceed the set standards, the device emits three urgent beeps and changes interface colors (green for good, orange for warning, red for bad), ensuring immediate response with clear visual alerts.5. Smart Linkage Control: Featuring semiconductor sensors for accurate measurements, the temperature humidity meter can connect to smart plugs to control external devices. For example, set the exhaust fan to turn on when CO2 levels exceed 1500ppm and off when levels drop below 800ppm, saving energy. Ideal for homes, schools, hospitals, kids' rooms, hotels, restaurants, cars, and more.This product has high sensitivity. However, it can only detect, and the data will not be very accurate (called qualitative but not quantitative). It can only detect mixed carbon dioxide, such as carbon dioxide exhaled by the human body, and cannot detect pure carbon dioxide.DIY Supplies: WoodworkingGas Type: MultifunctionalWith LCD Screen Or No