Onyx® II 9550

Military Fingertip Pulse Oximeter

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Onyx® II 9550

Military Fingertip 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.


Military Certified

Reliable and durable in demanding environments; only oximeter with U.S. Army and U.S. Air Force airworthiness certifications


Proven Reliability

Provides fast, accurate SpO2 and pulse rate measurements in a wide range of patients


Energy Efficient

Provides approximately 2,500 spot-checks based on 21 hours of operation using (2) AAA-size alkaline batteries

Unmatched Accuracy

Clinically proven accuracy for all skin pigmentations and even for patients with low perfusion

Large LED Display

SpO2 and pulse rate measurements can be read from any angle, day or night

Pulse Quality Indicator

Bright, easy-to-see LED provides a quick and accurate assessment of patient readings

Wide Fit Range

Fits pediatric to adult patients; accommodates a wide range of finger thicknesses, 8 to 26 mm (0.3 to 1.0 in.)

Small and Light

Can be carried anywhere—on a lanyard, in a carrying case, or in a pocket; weighs less than 2 ounces

Energy Efficient

Power saving feature allows (2) AAA batteries to provide approximately 2,500 spot-checks or 21 hours of continuous operation

Trusted Reliability
used by the U.S. Armed Forces

The Onyx® II 9550 is reliable and durable in the most demanding environments and has U.S. Army and U.S. Air Force airworthiness certifications.

Advanced Technology
in a Compact Device

The Onyx II 9550 combines Nonin advanced pulse oximeter technology and compact design. It can be carried anywhere for spot-checks and short-term monitoring.


  • Description


  • Carrying Case


  • Fingertip Carrying Case


  • Protective Carrying Case


  • Fingertip Lanyard


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