Simply warm your finger and reposition it so that it is right under the LED lights. Beware of Imitation, Buy Original.
Innovo Deluxe Fingertip Pulse Oximeter Blood Oxygen Monitor Heart Rate Meter
Fingertip Pulse Oximeter Blood Oxygen SpO2 Heart Rate Monitor – LED Display
Professional Fingertip Finger Pulse Oximeter Blood Oxygen Monitor Heart Rate++
Finger Pulse Oximeter Blood Oxygen Monitor Heart Rate Monitor Bluetooth free APP
Fingertip Pulse Oximeter Blood Oxygen Monitor Pulse Ox, Heart Rate and Fast Spo2
