A compact meter that allows you to check CO2 concentration, temperature, and humidity at a glance. - Model Name: CO2 Manager - Size: Approximately 136 x 78 x 86mm - CO2 Concentration Measurement Range: 400-5000ppm Please refer to the photos for details! Thank you for viewing. This item has been stored at home unused, so I will sell it to someone who understands this. There are 3 in stock, so please comment if you would like to purchase multiple!