A Carbon Dioxide (CO2) Sensor is a device used to measure the amount of CO2 in the air. This type of sensor is commonly used in HVAC (Heating, Ventilation, and Air Conditioning) systems to monitor the air quality and adjust the air circulation accordingly. The sensor measures the amount of CO2 in the air and sends a signal to the HVAC system to adjust the air circulation and ventilation to maintain the desired air quality. CO2 sensors are also used in other applications such as industrial and commercial buildings, schools, and hospitals to ensure that the air quality is within the acceptable range. CO2 sensors are important for maintaining a healthy and comfortable environment for occupants. They help to reduce the risk of respiratory illnesses, allergies, and other health issues caused by poor air quality. Additionally, they can help to reduce energy costs by ensuring that the HVAC system is operating efficiently.