Hiro Corporation Made in Japan NDIR Multi-function CO₂ Concentration Meter 【High-Precision NDIR Sensor】 Adopting an optical sensor NDIR technology, it accurately measures CO2 concentration in real-time. You can always monitor the indoor air quality. 【Multi-function Display】 Large screen display allows you to check temperature, humidity, and CO2 concentration at a glance. It has high visibility and is designed to be easy to use in any environment. 【Alarm Function】 Alerts you with an alarm when the CO2 concentration exceeds the set value. Provides strong support for maintaining a comfortable space. - Product Name: Multi-function CO2 Concentration Meter - Sensor Type: Optical Sensor NDIR - Temperature Measurement Range: 0-50℃ - Humidity Measurement Range: 0-100%RH - Alarm Function: ON/OFF selectable - Large Screen Display: Highly visible large screen display - Usable Locations: Can be used in various locations - CO2 Concentration Warning: Safe below 400ppm Thank you for viewing.