The Onyx Vantage 9590 is a small, lightweight, portable finger pulse oximeter for 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 digits (fingers, thumb, toes) in a wide-range of environments, including hospitals, clinics, long-term care facilities, skilled nursing facilities, emergency medical services, and home healthcare services.