1.8in1 Air Quality Tester This detector tests and displays the concentration of PM1.0, PM2.5, PM10, CO2, TVOC, HCHO, and also measures temperature and humidity, with WiFi connectivity for cloud data access. accuracy sensors: Uses a precision NDIR infrared CO2 sensor, a particle sensor, a semiconductor sensor, an optical sensor, and a distance sensor. Provides sensitivity, strong interference resistance, stable performance, and low power consumption. LCD Color display: Large color LCD with autobrightness adjustment based on ambient light to keep data clearly visible and easy on the eyes. Supports switching the onscreen content between HCHO TVOC and PM10 at power on. Sleep wake and cloud connectivity: The screen automatically turns off to save energy, while the sensor data continues to transmit to the cloud via WiFi. Realtime values can be viewed in the app. The device includes a distance sensor; in the dormant state (30 seconds without sensing) you can approach the device or wave in front of it to wake the screen. Use scenarios: Home environment: Monitor PM levels, CO2, TVOC, HCHO, and comfort metrics to maintain a healthy living space and optimize ventilation and humidity control. Office or classroom: Track indoor air quality to manage occupancy, ventilation, and air freshness, helping maintain a productive environment. Nursery or kids' room: Keep a watch on air quality, temperature and humidity to support a safe and comfortable environment for children. Key attributes: allinone air quality monitoring, multiple sensory inputs (CO2, PM1.0/2.5/10, TVOC, HCHO, temperature, humidity, distance), WiFi connectivity, color LCD display with adaptive brightness, energysaving sleep mode with wake gestures, and appbased realtime data access.