Amazon.com: Zacurate(R) Pro Series 500DL Fingertip Pulse Oximeter Blood Oxygen Saturation Monitor with Silicon Cover, Batteries and Lanyard: Health & Personal Care
Wednesday, December 26th, 2018https://www.amazon.com/Zacurate-Fingertip-Oximeter-Saturation-batteries/dp/B016J60WB0
https://www.beyondmedshop.com/products/500dl
https://cdn.shopify.com/s/files/1/0641/4457/files/Acc_U_Rate_500D_English_Manual_Version_1.2.pdf
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Normal SpO2 values vary between 95 and 100%.