Summary: The S8606 CO2 detector features a carbon dioxide sensor along with temperature and humidity sensors. It is designed to measure carbon dioxide levels, temperature, and humidity in various environments and is widely used in agriculture, aquaculture, and industrial applications such as greenhouses, livestock farms, beer and carbonated beverage production, energy-saving and environmental protection processes, and underground operations safety monitoring.In everyday environments including kindergartens, schools, office buildings, shopping malls, supermarkets, train stations, hospitals, and other public spaces, monitoring carbon dioxide concentration helps improve air quality, enhance learning and work efficiency, and support public health and safety by helping prevent the spread of infectious diseases.Features: - Measures CO2 concentration, temperature, and humidity - Temperature unit selectable between C and F - HOLD function to freeze measurement readings - Two-line LCD display showing CO2 level, temperature, and humidity simultaneously - Backlight color indication (green/yellow/red) based on CO2 levels - Auto power-off function to conserve battery life - Requires 3 x 1.5V AAA batteries (not included)Note: - Measurement range: 4005000 ppm. If CO2 levels exceed 5000 ppm, the device will display "H1" and emit a continuous alarm tone. The unit must be powered off and restarted before further measurements can be taken. - S8601 model uses a semiconductor sensor. - Product design, color, or appearance may vary slightly due to ongoing updates. Please consider this before placing your order if specific color or appearance is required. - Material: Plastic - Color: Black + Red Package Contents: 1 x CO2 Detector Note: Other items not included. Lighting effects and display differences may cause slight variations in color between the product image and actual item. Measurement error allowance: 13 cm.