Honeywell TR50-3D CO2 Temperature Humidity Multi-Sensor with Sylk Display is an indoor environmental sensor designed for compatible building automation and HVAC control systems. It monitors carbon dioxide, temperature, and humidity levels, transmitting real-time measurements through the Sylk communication interface for accurate system control. Used with air handling units, ventilation... https://www.partshnc.com/tr50-3d-honeywell-co2temphumidsensorsylkwdis