Amazon.com: Finger Pulse Oximeter, (SpO2) Blood Oxygen Saturation Monitor with Pulse Rate Measurements and Pulse Bar Graph, Digital Reading LED Display : Health & Household
Pulse Oximeter: How to use a Pulse Oximeter? A Step-by-Step guide | - Times of India
Finger Pulse Oximeter [BM1000] : ID 4580 : $19.50 : Adafruit Industries, Unique & fun DIY electronics and kits