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Why does a pulse oximeter show different readings on different fingers at the same time? - Quora
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Amazon.com: Pulse Oximeter Fingertip, Heart Rate Monitor with Large LED Display, Blood Oxygen Saturation Monitor for Adults and Kids, Accurate Fast SPo2 Reading Oxygen Meter with Lanyard (Black-Silver) : Health & Household
Finger Pulse Oximeter B-85 - BOXYM Produces Best and Durable Home Medical Equipments - BOXYM.COM