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Wellue Pulse Oximeter Fingertip, Blood Oxygen Saturation Monitor with Built-in Memory, Beep reminder, OLED screen, Batteries and Lanyard Tools & Home Improvement No more worrying about scratchingAbout This ACCURATE & RELIABLE: Plethysmograph wavefom provides a visual representation of heartbeat and the amount of blood flowing through the blood vessels; perfusion Index corresponds to pulse strength; both of them help determine the accuray of readings BUILT IN MEMORY: Store up to 12 sets of O2 level and Pulse Rate on the device; Quickly view your last 12 times historical data with one click on finger pulse oximeter SPOT CHECK MODE: After 30s of