Ideal for monitoring the CO2 concentration in buildings where people congregate. Large display with history function for table and wall mounting, indicates temperature, humidity and CO2 concentration. Items supplied USB mains supply, Micro SD card and light (LED). Ideal for monitoring the CO2 concentration in buildings where people congregate. Large display with history function for table and wall mounting, indicates temperature, humidity and CO2 concentration. Items supplied USB mains supply, Micro SD card and light (LED).