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 including kindergartens, schools, office buildings, shopping malls, supermarkets, 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 levels, temperature, and humidity simultaneously - Backlight color indication: green, yellow, or red based on CO2 levels - Auto power-off function - Powered by 3 x 1.5V AAA batteries (batteries not included) Note: - Measurement range: 400–5000 ppm. If CO2 levels exceed 5000 ppm, the device displays "H1" and emits a continuous beep. The unit must be turned off and restarted to resume operation. - S8601 model uses a semiconductor sensor. - Product design, color, or appearance may vary slightly due to updates. Please note that minor differences in color or form may occur. 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 in the color of the item shown in photos compared to the actual product. Measurement error allowance is +/- 1–3 cm.