Pulse oximeter (Beers, Lamberts law, Working, Graph, Isobestic point) in less than 15 minutes - YouTube
Log and Graph the Data | Pulse Oximeter Wireless Data Logger | Adafruit Learning System
Pulse Oximeter,fingertip Rotatable OLED Display to Show Waveform, SpO2 Blood Oxygen Saturation, Bar Graphs and Heart Rate Monitor - Walmart.com
Amazon.com: Fingertip Pulse Oximeter, Blood Oxygen Saturation Monitor (SpO2) with Pulse Rate Measurements and Pulse Bar Graph, Portable Digital Reading LED Display, Batteries and Carry Case Included : Health & Household