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 product manufacturing, and underground operations safety monitoring. In everyday environments including kindergartens, schools, offices, shopping malls, supermarkets, transportation stations, and hospitals, monitoring carbon dioxide levels helps improve air quality, enhance learning and work efficiency, and support public health and safety. Features: - Measures CO2 concentration, temperature, and humidity - Temperature unit switchable between Celsius and Fahrenheit - HOLD function to freeze measurement readings - Two-line LCD display showing CO2 levels, temperature, and humidity simultaneously - Backlight color indication: green, yellow, or red based on CO2 levels - Auto power-off function to conserve battery life - Powered by 3 x 1.5V AAA batteries (not included) Warm Tips: - Measurement range: 400-5000ppm - If CO2 concentration exceeds 5000ppm, the device displays "H1" and emits a continuous beep. The unit must be turned off and restarted before further testing. - S8601 uses a semiconductor sensor Note: Product design and appearance may be updated periodically. Actual product may vary slightly in color or form. Please consider this before ordering if specific appearance or color is required. Material: Plastic Color: Black + Red Package Contents: 1 x CO2 Detector Note: The package includes only the items listed above. Other accessories are not included. Lighting and display differences may cause slight variations between the product image and actual item. Measurement error allowance: +/- 1-3 cm.