PRÉCISE 3000, the oxygen-conserving system – safe, economical and accurate Conventional systems administer a preset bolus of oxygen (oxygen quantity) for each breath taken. Even if the user draws deeper breaths, e.g. under strain, the oxygen quantity administered remains the same for each inhalation, thus reducing the concentration of oxygen in the lungs. This process actually counteracts the body’s natural oxygen requirement. With PRÉCISE 3000 the oxygen supply is matched to the user’s requirement thanks to the AO2D system (automatic O2 dosage). The result for the user: more effective supply combined with lower costs!