Niwa CO2 SensorOur CO2 sensor is compatible with all Grow Hub models and does NOT WORK as an independent sensor. Once you receive your CO2 sensor, youll replace your existing sensor module with your new CO2 sensor module and receive all the preexisting readings you had before (VPD, temperature, relative humidity, light levels, dew point, and now CO2!) and monitor your CO2 equipment. PLEASE NOTE: This is ONLY the sensor unit. This is not a standalone unit. Sensors