Wellue Fingertip Pulse Oximeter, Blood Oxygen Saturation Monitor with Batteries for Wellness Use Bluetooth FS20F, Black

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ACCURATE AND RELIABLE: Accurately measures your blood oxygen saturation levels(SpO2 ), pulse rate, pulse strength and pulse waveform and display them conveniently on a large OLED screen.
WARNINGS FOR ABNORMAL READINGS: The value on screen will flash when abnormal SpO2 or pulse rate is detected. Keep an eye on your SpO2 and PR.