The Otis 7 Series of pulse oximeters guarantee an immediate measurement, accurate and non-invasive of the saturation of oxygen in the arterial blood and of the pulse rate. They are exceptionally compact and light. They are particularly versatile being equipped with peripheral data collector (clip on or disposable) which is easily positioned and adaptable for use on subjects of all ages. Powered by batteries, it can be used also during transport. It is suitable for use wherever there is little space and in particular during emergencies, as well as in neonatology, intensive care, general medicine and pneumology wards. They are easy to use and can therefore be used both by the paramedic personnel and by the patients themselves as a home therapy instrument.