The oximeter is showing reading for my mom, sister, and me, but it's not showing any readings for my dad. Is it the machine's fault? - Quora
Amazon.com: LPOW Fingertip Pulse Oximeter, Blood Oxygen Saturation Monitor ( SpO2) with Pulse Rate, Perfusion Index with Alarm, OLED Display, Batteries and Lanyard Included : Health & Household
Easy@Home Fingertip Pulse Oximeter (Not for Medical Use) - SpO2 Blood
Home pulse oximeters can help diagnose covid-19 symptoms, but it's easy to use it the wrong way - The Washington Post
Pulse Oximetry Basic Principles and Interpretation | Iowa Head and Neck Protocols
Pulse Oximeters Can Give False Readings In COVID-19 Patients With Dark Skin : Shots - Health News : NPR