BioTherm Solutions D.O. Stat Controller for Dissolved Oxygen SystemBioTherm Hydro Sciences D. O. Stat Your crop depends on consistency, and dissolved oxygen (DO) is a difficult variable to control, but the BioTherm DO Stat works with the TOOB to optimize DO levels at your set point. The DO Stat reads dissolved oxygen and temperature in your irrigation line or tank and controls the oxygen infusion process. The touch screen user interface displays real time data and allows navigation to adjust settings and alarms.