The Nonin Onyx Vantage 9590 Finger 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. t is intended for spot-checking of adult and pediatric patients on digits (fingers, thumb, toes) in a wide-range of environments to include hospitals, clinics, long-term care facilities, skille