Carbon dioxide (CO2) monitor with colorchanging screen, large LCD, and 24hour realtime monitoring. Key benefits Instant visual airquality status: screen color shifts from green to orange to red as CO2 concentration rises, so you can assess ventilation at a glance. Health and safety: accurately and quickly measures indoor CO2 to help identify poor ventilation, especially useful during winter when windows are often closed. Multiparameter monitoring: continuously displays CO2 concentration plus indoor temperature and humidity in real time for a more complete view of air conditions. Clear, easytoread data: large LCD screen and continuous 24hour monitoring let you review current and recent conditions without guesswork. Wide applicability: designed for indoor environments where CO2 can build up, including schools, offices, greenhouses, factories, hotels, hospitals, and laboratories. Functions and performance Measures CO2 concentration with fast, accurate response to changing conditions. Monitors indoor temperature and relative humidity in real time alongside CO2. Visual alarm via color change (green → orange → red) to simplify decisionmaking about ventilation. Compatibility and use Intended for indoor airquality monitoring in spaces where people or processes can raise CO2 levels. Practical for use on a desk, countertop, or any visible indoor location where quick visual feedback helps manage ventilation and comfort. Practical scenarios Classroom: Teachers monitor CO2 during lessons and open windows or adjust HVAC when the screen shifts from green to orange or red to maintain a healthy learning environment. Office meeting room: Check CO2 and humidity before and during long meetings to decide when to ventilate and keep participants comfortable and alert. Greenhouse or lab: Track CO2, temperature, and humidity in real time to support plant growth or controlledenvironment experiments and respond quickly to changing conditions. What it offers A straightforward, reliable way to monitor indoor CO2, temperature, and humidity in real time. Visual colorcoded feedback and a large LCD for fast interpretation and better ventilation decisions. Suitable for a broad range of indoor settings where maintaining air quality matters.