The Onyx® II 9550 fingertip pulse oximeter has been particularly tested by professionals and military and has been certified by them. It provides swift, medically proved Spo2 and pulse rate readings among the diversified range of patients. The device is all set for accuracy. The Onyx II 9550 is dependable and sturdy in regions where it is required most. The device precisely has been intended for the apt utilization in helicopters and thus certified by US Army and U.S. Military Airworthiness. For additional information users can contact Nonin. It automatically turns on and off for fast, easy spot-checks. It has been clinically proven in the diversified range of patients and settings also counts patients with dark skin color and low perfusion. This efficient device permits for 2500 spot-checks or 21 hours of continuous use. With a big, bright LED display SpO2 the pulse rate can be legible from every angle and in both day and night. On top of that it also provides Wide Range of Finger Sizes Accommodates wide range of finger thicknesses measuring from 0.3 - 1.0 inch.