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 the environment 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 operation safety. In everyday environments such as kindergartens, schools, office buildings, shopping malls, supermarkets, stations, and hospitals, monitoring carbon dioxide levels 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, temperature, and humidity simultaneously - Backlight color indication: green, yellow, or red based on CO2 levels - Auto power-off function Requires 3 x 1.5V AAA batteries (not included) The instrument has a measurement range of 400–5000 ppm. If CO2 levels exceed 5000 ppm, the display will show H1 and emit a continuous beep. The device must be turned off and restarted to resume operation. Note: S8601 uses a semiconductor sensor. Product design, color, or appearance may vary slightly due to ongoing updates. Please consider this before ordering if specific color or appearance is required. Material: Plastic Color: Black + Red Package Contents: 1 x Detector Note: Light reflection and differences in display screens may cause slight variations in the color appearance of the product. Measurement error allowance is ±1–3 cm.