The BETA-8 CO2 Controller offers a precision NDIR CO2 sensor/controller in an affordable, easy-to-use package. The BETA-8 features a high-quality remote CO2 sensor (with 16-foot cable) and built-in photocell to automatically activate your supplemental CO2 system to maintain CO2 PPM levels during daylight hours only. The BETA-8 also features adjustable deadband and min-max memory. The CO2 sensor can be easily recalibrated and will continue to perform accurately for many years to come.