Summary: The S8601A 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 various environments 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 operations safety monitoring. 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. Features: - Measures CO2 concentration, temperature, and humidity - Temperature unit switchable 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 - Powered by 3 x 1.5V AAA batteries (not included) Note: The measurement range is 400–5000 ppm. If levels exceed 5000 ppm, the device displays "H1" and emits a continuous beep. The unit must be powered off and restarted before further testing. The S8601A uses an infrared sensor, which provides high sensitivity and accuracy in CO2 detection. Product design and color may vary slightly from the image shown due to ongoing updates. Appearance and color may differ without prior notice. Please consider this before ordering if specific color or appearance is required. Material: Plastic Color: Black + Red Package Contents: 1 x CO2 Detector Note: Other items not included.