9-in-1 indoor air quality monitor with built-in sensors for temperature humidity and CO2 to help you maintain a healthier living space for your family. Real-time data updates uses advanced infrared and electrochemical detection to deliver current readings so you can see how your room air quality changes at a glance. One-key calibration simple calibration by pressing the power button several times to keep readings accurate without complex setup. Large display a large TFT full-color screen clearly shows power status temperature humidity and CO2 levels for quick interpretation. Compact durable design compact handheld unit with a sturdy housing designed for everyday use in homes offices classrooms and other indoor spaces. Use scenarios - Home: monitor living rooms bedrooms or nurseries to protect family health - Office or classroom: maintain comfortable well ventilated spaces by tracking CO2 and humidity - Kitchen or gym: manage ventilation during activities when CO2 and humidity can spike Performance and practicality standalone device with reliable readings and fast response, designed for easy operation and clear results without external sensors.