Multifunctional 9‑in‑1 Indoor Air Quality Tester — clear, reliable monitoring for healthier indoor spaces Key benefits Know the air your family breathes: monitors temperature, humidity and carbon dioxide levels so you can maintain a comfortable, safe environment. Make fast decisions: real‑time updates let you respond immediately to poor air quality (ventilate, adjust humidifier/dehumidifier, or change room use). Keep readings trustworthy: on‑device one‑key calibration lets you recalibrate sensors quickly by pressing the power button several times — no complex setup required. Easy to read and operate: a large TFT full‑color screen displays power level, temperature and humidity clearly for quick assessment at a glance. What makes it stand out 9‑in‑1 multifunction design with built‑in sensors to deliver a broad view of indoor conditions while staying compact and easy to use. Advanced infrared and electrochemical detection technologies provide continuous, real‑time monitoring so you stay informed about changes in your room atmosphere. Simple calibration and intuitive display reduce maintenance and make reliable monitoring accessible to non‑technical users. Practical applications Home: monitor CO2 and humidity in living rooms, bedrooms or basements to improve sleep quality and reduce mold risk. Workspaces and classrooms: track CO2 buildup and temperature to maintain alertness and comfort during longer occupancy. Nursery or elder care: continuous temperature and humidity checks help maintain a safe, comfortable environment for vulnerable occupants. User experience and performance Real‑time data updates let you spot trends and take action when levels change. Large full‑color TFT display shows essential information (power level, temperature and humidity) in a clear, readable format for quick decisions. One‑key calibration keeps sensor data aligned without complicated procedures — press the power button several times to recalibrate. Who should consider this product Families and homeowners who want actionable indoor air data. Office managers and teachers responsible for indoor comfort and air quality. Caregivers and facility operators who need straightforward monitoring without technical overhead. This air quality tester combines real‑time sensing, simple calibration and a clear display to make monitoring indoor conditions practical and reliable for everyday use.