Nonin 9550 Onyx II finger pulse oximeter

The Nonin Onyx II 9550 Fingertip Pulse Oximeter is a small, lightweight, portable device indicated for use in measuring and displaying functional oxygen saturation of arterial hemoglobin (%SpO₂) and pulse rate of patients who are well or poorly perfused.

It is intended for spot-checking of adult and pediatric patients on fingers (other than the thumb) 0.3–1.0 inch (0.8–2.5 cm) thick. Intended use environments include hospitals, clinics, long-term care facilities, skilled nursing facilities, emergency medical services, and home healthcare services.