Hospital - save life

Written by Smriti Srivastava

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A pulse oximeter is a small medical device. It is used to measure oxygen levels in the blood. It is a very useful health device. It is placed on the finger. It works without taking blood. It is easy t...

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Smriti SrivastavaI am Smriti and I am a young and creative writer I enjoy learning new things actually my ideas for writing