Nonin 9550 Onyx II Finger Pulse Oximeter Nonin Onyx II 9550 Finger Pulse Oximeter Military Tested Certified The Nonin Onyx II finger pulse oximeter has been tested under the most rigorous circumstances. Clinically proven oxygen saturation and pulse rate readings, the Onyx II has received the US Army and US Military Airworthiness Certifications, allowing it to be used in helicopters. FEATURES: Quick Spot-Checks: The Onyx II turns on and off quickly for easy spot-checks Proven Accuracy: Clinically proven accuracy in the widest range of patients and settings, including patients with dark skin color and low perfusion Efficient: Allows for 2500 spot-checks or 21 hours of continuous use Large Bright LED Display: SpO2 and pulse rate can be read from any angle, day or night Wide Range of Finger Sizes: Accommodates a wide range of finger thicknesses, from 0.3 - 1.0 inch (8 mm to 26 mm) Durable and Reliable: The Onyx II 9550 has the US Army and US Air Force aeromedical certification for use in helicopters SPECIFICATIONS: Self-Contained: No sensors or cables to tangle or lose Power Source: 2 x AAA batteries