The Sentinel Temperature, Relative Humidity and CO2 Controller
eliminates guesswork while it controls indoor garden environments with
accuracy, and this upgraded version is even better than the original! It
uses an even more accurate CO2 sensor, a more powerful CPU, a removable
remote probe assembly, a moisture-resistant housing, and plant-friendly
green LED function lights. Its combination CO2 & light level sensor
is housed in a separate remote sensor enclosure that can be located up
to 100 ft from the controller. It features an easy-to-read LED display
and simple buttons to enter the desired PPM settings and display the
current PPM reading. It can also be connected to other controllers so
that the CO2 is disabled, and it can be operated in Fuzzy-Logic mode
(for compressed CO2), or ON-OFF (for CO2 generators). It also has the
ability to control 3 other devices, a cooling device, a heating device
and humidity device.