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 Celsius and Fahrenheit - HOLD function to freeze measurement results - 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 Uses 3 x 1.5V AAA batteries (not included) The instrument has a measuring range of 400-5000ppm. If levels exceed 5000ppm, "H1" will be displayed with a continuous audible alert. The device must be powered off and restarted before further measurements can be taken. Note: S8601 uses a semiconductor sensor. Product design, color, or appearance may vary slightly due to ongoing updates. Please consider this before ordering if specific appearance details are important to you. Material: Plastic Color: Black + Red Package Contents: 1 x Detector Lighting and display differences may cause slight variations in the color shown in images compared to the actual product. Measurement error allowance is +/- 1-3cm.