New Black Nippon Seiki CO2 Lamp CO2 Sensor Carbon Dioxide Meter/Detector CO2 Concentration Alarm High-Precision Meter Made in Japan Desktop Type CO2 concentration meter "CO2lamp" - Reliable Made in Japan - Employs the next-generation optical sensor recommended by the Ministry of Economy, Trade and Industry in its "Guidelines for the Selection of Carbon Dioxide Concentration Meters." The "light" (illumination) indicates ventilation guidelines from a distance and from all directions (360°). The light changes from blue during normal operation to yellow when caution is needed, and to red when ventilation is required, allowing you to check the current status even from a distance. Equipped with a sensor that utilizes the reaction of carbon dioxide to infrared wavelengths, it accurately detects the carbon dioxide concentration in enclosed spaces. When installed in places where people gather, such as restaurants, schools, and offices, it helps to prevent infection by understanding the ventilation situation.