Summary: S8606 / S8601A CO2 detector features a carbon dioxide sensor along with temperature and humidity sensors. This instrument measures 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 work safety.In everyday environments including kindergartens, schools, office buildings, shopping malls, supermarkets, train stations, hospitals, and other public spaces, monitoring carbon dioxide concentration helps improve air quality, enhance learning and work efficiency, prevent the spread of infectious diseases, and support public health and safety.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/red) based on CO2 levels - Auto power-off function to conserve battery life - Powered by 3 x 1.5V AAA batteries (not included)Note: - Measurement range: 4005000 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. - Model S8601 uses a semiconductor sensor. - Model S8601A uses an infrared sensor, which provides higher sensitivity and accuracy. Please note that product design and appearance may be subject to minor updates or variations. Colors and styling may differ slightly from images shown. Please consider this before ordering if specific color or appearance details are important to you.Material: Plastic Color: Black + Red Package Contents: 1 x CO2 Detector Note: Other items not included. Lighting effects and display differences may cause slight variations in perceived color.