The Trolmaster CO2 Sensor (MBS-S8) from Trolmaster. Hydro X CO2 Sensor is a great tool that measures the CO2 PPM within your grow space. Using the MBS-S8 enables users to connect and control their supplemental CO2 system using the Hydro-X, with ease, It is for use in combination with one or more DSC-1 CO2 device modules. General Information Output Voltage - 0~11.5V Maximum Current - 0.2A Working Environment - Temperature 32-122°F, Humidity=90% Dimensions - 160mm(L) x 86mm(W) x 86mm(H) Benefits Built-In Photocell Detecting Day/Night Mode Plug & Play How to Use It’s important that the sensors stay dry and clean to prevent failure. Ensure that no water or condensation collects on the sensor. Comes with the following: 1 x CO2 Sensor (MBS-S8) 1 x 16ft RJ12 Cable 1 x RJ12 T-Splitter