S8606 CO2 detector features a carbon dioxide sensor along with temperature and humidity sensors. The device is designed to measure carbon dioxide levels, temperature, and humidity in the environment and is commonly used in agricultural, aquaculture, and industrial applications such as greenhouses, livestock farms, beer and carbonated beverage production, energy-saving and environmental protection product manufacturing, and underground operational safety monitoring. In everyday environments including kindergartens, schools, office buildings, shopping malls, supermarkets, transportation stations, and hospitals, monitoring carbon dioxide concentration helps improve indoor 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 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 for energy saving Uses 3 x 1.5V AAA batteries (not included) Note: - Measurement range: 400–5000 ppm. If levels exceed 5000 ppm, the display will show H1 and emit a continuous beep. The device must be powered off and restarted before further testing. - S8601 uses a semiconductor sensor - Product design, color, or appearance may vary slightly due to updates or manufacturing differences. Please consider this before ordering if specific appearance attributes are required. Material: Plastic Color: Black + Red Package Contents: 1 x Detector Note: Light reflection and differences in display screens may cause slight variations between the product image and actual item. Measurement error tolerance is +/- 1–3 cm.