Onyx II 9550

Availability: In Stock
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.


Oxygen Saturation Display Range: 0% to 100% SpO2
Pulse Rate Display Range: 18 to 321 beats per minute (BPM)
Declared Accuracy:
The tables below show Arms values measured using the Onyx II 9550 in a clinical study in non-motion conditions.

Accuracy Summary by Decade

Decade Oxygen Saturation (Arms)
70 – 80% ±2
80 – 90% ±2
90 – 100% ±2
70 – 100% ±2

This graph shows plots of the error (SpO2 – SaO2) by SaO2 using the
9550 with a linear regression fit and upper 95% and lower 95% limits of
agreement. Each sample data point is identified by subject from a clinical
study in non-motion conditions.

SpO2 Low Perfusion Accuracy (Arms*) 70 to 100% ±2 digits
Pulse Rate Declared Accuracy Range (Arms*): 20 to 250 BPM ±3 digits
Low Perfusion Pulse Rate Declared Accuracy Range (Arms*): 40 to 240 BPM ±3 digits
Measurement Wavelengths and Output Power**:
Red: 660 nanometers @ 0.8 mW maximum average
Infrared: 910 nanometers @ 1.2 mW maximum average

Operating: 23 °F to 104 °F / -5 °C to 40 °C
Storage/Transportation: -40 °F to 158 °F / -40 °C to 70 °C
Time (from storage) for monitor to be ready for its intended use: 3 minutes to warm from -40 °C to -5 °C
5 minutes to cool from 70 °C to 40 °C

Operating: 10% to 90% non-condensing
Storage/Transportation: 10% to 95% non-condensing

Operating: Up to 12,192 meters (40,000 feet)
Hyperbaric Pressure: Up to 4 atmospheres

Battery Life:
Operating: Approximately 10,000 spot checks, or 63 hours of continuous operation using new alkaline batteries.
Storage: 48 months

Classifications per ANSI/AAMI ES60601-1 / CAN/CSA-C22.2 No. 60601-1:

Degree of Protection: Type BF-Applied Part
Enclosure Degree of Ingress Protection: IP33
Mode of Operation: Continuous

This product complies with ISO 10993-1, Biological evaluation of medical devices – Part 1: Evaluation and testing.
This device is not made with natural rubber latex.

* ±1 Arms represents approximately 68% of measurements at zero bias.
** This information is especially useful for clinicians performing photodynamic therapy.



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