How does the plethysmograph work?
Each wave (see above) corresponds to a heart beat and the wave amplitude corresponds to the amount of blood flowing through the blood vessels. If the wave amplitude is low, this means that your blood perfusion is too low for a reliable read. You should retake your measurement and make sure that your finger is positioned right under the LED lights.
The 500E also retains the dual color OLED rotatable display, allowing you to view your results in any directions.
Suitable for sports enthusiasts and those who are interested in measuring their SpO2 and PR. WARNING! This is not a medical device! This product should be used for sports and aviation only.