Shinwa Sokutei Digital Carbon Dioxide Concentration Meter, Optical Type with Correction Function, 78977

Displays carbon dioxide concentration over the past 24 hours in a graph. Time, temperature, and humidity are also displayed, allowing you to manage temperature and humidity at the same time. It uses an optical measurement method designated by the Ministry of Economy, Trade and Industry and is equipped with a correction function. The carbon dioxide concentration in the air is displayed as a number and with color changes to alert you. Normal color (green) 0-999ppM, ventilation recommended color (yellow) 1,000-1,999ppM, ventilation required color (red) 2,000ppM.