Overview: This is a carbon dioxide detector, using non-scattering infrared technology, fast response, high precision measurement, including measuring range 400-5000PPM. It is dedicated to monitoring air quality, temperature and relative humidity. Features : Accurate and reliable: Use to test indoor carbon dioxide concentration accurately and quickly, and monitor indoor temperature and humidity in real time. Carbon dioxide sensor: using non-scattering infrared technology, full temperature range correction. High measurement accuracy, fast response, resolution up to 1PPM. 2 quality warnings: The indoor air carbon dioxide meter has 2 types of warnings air quality, 3-color LED indicators and a comfortable facial expression in the mirror. Large color screen: large color screen reads the display Intuitive digital LED/LCD display + intelligent backlight, and it can monitor carbon dioxide changes in real time for 24 hours. Wide range of use: It is suitable for detecting carbon dioxide pollution gas in homes, kitchens, bedrooms, offices, schools, cars, hotels, travel, camping, parties, etc. Especially if there are babies, children and pregnant women among them. Note: Please connect the USB cable of this product to the computer to charge it, or use it with a DC 5V adapter. The product can also display monitoring status while charging. Instructions: One-button start, press the button for 3 seconds to start the test, no calibration is required. Press the button for 3 seconds, the machine turns off. < p>Features: Item type: CO2 monitor Model: CO2-3 Display: digital display < p>Unit of measurement: PPM//%RH Measuring method: CO2 sensor/temperature and humidity sensor Mounting method: placed horizontally Measuring way: automatic power-on detection Measuring technology: Non-scattered infrared absorption (NDIR) Measuring range: 400 -5000PPM Working range: 4.26?m Response time: Storage temperature range: -10-55 Preheating time: 25S (functional), 2min (90% accuracy), 10min (maximum accuracy)< /p> Standby time: 3 hours Accuracy tolerance: C02 concentration: 50?PPM+5?%*Reading/temperature: 2?% RH Online alarm?: GOOD: 400-1000PPM (fresh air)/NORMAL: 1001-2000PPM (mild hypoxia)/POOR: 2001-5000PPM ( severe hypoxia) Updated data: