9-in-1 Air Quality Detector — Professional, accurate monitoring for healthier indoor environments Key benefits Comprehensive monitoring: One device measures CO2 concentration, CO concentration, TVOC value, HCHO value (formaldehyde), PM2.5 and PM10, temperature and relative humidity — all in a single unit so you can quickly see the full picture of indoor air quality. Faster, more reliable detection: Uses an air-semiconductor gas sensor, a dedicated PM2.5 particulate sensor and an electrochemical sensor paired with a high-performance processing chip for stable, accurate readings (accuracy can reach 1 ppm for gas measurements). Easy to read and respond: Large digital display with backlight shows current values clearly and supports an alarm function so you can be alerted immediately when a parameter exceeds safe levels. Long runtime and low maintenance: Built-in high-capacity 2000 mAh battery with low power consumption delivers extended operation without frequent battery changes. What makes it stand out Multi-sensor design (air-semiconductor + PM2.5 + electrochemical) for broad coverage of gases and particulates, reducing false readings common to single-sensor devices. High-performance chip improves sampling and processing, delivering consistent, precise measurements you can trust. Compact, portable and user-friendly: large backlit screen for clear viewing in any light and audible/visual alarm to prompt timely action. Typical uses Homes and apartments: Monitor CO2, formaldehyde and TVOCs after renovations, painting or new furniture to decide when it’s safe to occupy rooms. Offices and classrooms: Track CO2 and particulate levels to optimize ventilation, maintain comfort and reduce fatigue from stale air. Workshops and small industrial areas: Detect CO, particulate and VOC rises so you can take immediate protective measures. Features at a glance 9-in-1 multifunctional monitoring: CO2, CO, TVOC, HCHO, PM2.5, PM10, temperature, relative humidity Sensors: air-semiconductor sensor, PM2.5 sensor, electrochemical sensor High-performance chip; detection accuracy can reach 1 ppm Large digital backlit screen; supports alarm function Built-in 2000 mAh rechargeable battery; low power consumption for long endurance Practical, accurate and portable — ideal for anyone who needs reliable indoor air quality information to make timely, informed decisions.