Nonin Pulse Oximeter, modell 8500M. Min far använde den till sin forskning kring sömnapné. Är alltså ett proffsinstrument men mycket lättanvänt som kan användas som standalone eller kopplas upp mot dator. Nypris ligger för närvarande på 631 dollar. Drivs med sex AA-batterier.
Original bruksanvisning medföljer.

Simple-to-use - Bright LED displays, easy 3-button operation
Reliable - Proven Nonin Medical pulse oximetry technology and accuracy
Efficient - 100 Hours typical battery life
Flexible - numerous documentation options
Compatible - works with Nonin's full line of PureLight® sensors
Durable - extremely rugged construction
Indication of pulse quality - tri-color perfusion indicator
Accuracy you can trust in most challenging conditions, such as motion and low perfusion
Built to last in the most demanding environments
0 to 100% SpO2 oxygen saturation display range; 18 to 321 bpm pulse rate display range
Measurement wavelengths and output power - red: 660 nm @ 0.8 mW Maximum average; infrared: 910 nm @ 1.2 mW Maximum average
Indicators - LED, tricolor pulse quality display; 3 digit 7 segment LEDs, red numeric displays
-20 to 50°C Operating temperature
-30° to 50°C Storage temperature
10 to 90% noncondensing operating humidity
Up to 12000 m operating altitude
Up to 4 atmospheres hyperbaric pressure
1" x 3" x 6" Dimensions
Uses Six 1.5 V AA Batteries