S8601A CO2 detector features a carbon dioxide sensor along with temperature and humidity sensors to measure environmental CO2 levels, temperature, and humidity. This device 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, train 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. Key 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 level, temperature, and humidity simultaneously - Backlight color indicators (green/yellow/red) for quick status recognition - Auto power-off function to conserve battery life Requires 3 x 1.5V AAA batteries (not included) Product Notes: - 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 before further testing. - Utilizes an infrared sensor for improved sensitivity and accuracy in CO2 measurement. - Design and color may vary slightly from product images due to ongoing updates. Please note that appearance or color differences are possible. - Material: Plastic - Color: Black + Red Package Includes: 1 x CO2 Detector Note: Other items not included. Color may vary slightly due to lighting effects and monitor settings. Allowable measurement error: ±1–3 cm.