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Amazon.com: iProven Pulse Oximeter with Heart Rate Monitor on Fingertip, Oxygen Saturation Oximeter, Includes Batteries, Case and Lanyard (Blue) : Health & Household

Amazon.com: Nolan Care Pulse Oximeter - USA Stock - Oxygen Saturation Monitor with Fast and Accurate Heart Rate Monitor, Portable Fingertip Pulse Ox with Lanyard and Batteries : Health & Household

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