Summary: The 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, 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 by helping prevent the spread of infectious diseases.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 levels, temperature, and humidity simultaneously - Backlight color indication: green, yellow, or red based on CO2 levels - Auto power-off function Requires 3 x 1.5V AAA batteries (not included)Note: The measuring range is 4005000 ppm. If levels exceed 5000 ppm, the device will display "H1" and emit a continuous beep. The unit must be powered off and restarted before further testing.Warm Tips: This model uses an NDIR CO2 sensor. Product design, color, or appearance may vary slightly due to updates or manufacturing differences. Please consider this before placing your order if specific color or appearance is required.Material: Plastic Color: Black + Red Package Contents: 1 x Detector Note: Other items shown in images are not included. Due to lighting effects and monitor settings, the actual item color may vary slightly from the image. Measurement error allowed is +/- 13 cm.