Summary: The S8606 CO2 detector features a carbon dioxide sensor along with temperature and humidity sensors. This device 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, beverage production, energy-saving processes, and underground work environments. In everyday settings such as kindergartens, schools, offices, shopping malls, supermarkets, train stations, and hospitals, monitoring carbon dioxide levels helps improve indoor air quality, enhance learning and work efficiency, and support public health and safety. 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, temperature, and humidity simultaneously - Backlight color indication (green/yellow/red) for quick status recognition - Auto power-off function to conserve battery life - Requires 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 unit must be powered off and restarted to continue operation. - The S8601 model uses a semiconductor sensor. - Product design, color, or appearance may vary slightly due to updates. Please consider this before ordering if specific外观 characteristics are required. Material: Plastic Color: Black + Red Package Contents: 1 x Detector Note: Other items not included. Display lighting and monitor differences may cause slight color variations between the product image and actual item. Measurement error allowance: ±1–3 cm.