A teardown of the Apple Watch has revealed that it contains a plethysmograph rather than just a sensor which just measures heart rate, reports iFixit.Apple’s heart rate monitor is actually a plethysmograph—it looks and acts like a pulse oximeter, but Apple isn’t claiming it can measure your blood oxygen level. Why? Beats us.A pulse oximeter measures the difference between levels of the red pigment hemoglobin that carry oxygen in your blood. Oxygenated hemoglobin and nonoxygenated hemoglobin are different colors. The pulse oximeter uses two light-emitting diodes. One sends out invisible infrared light and the other sends out red light. By measuring the differences of light absorbed by each type of hemoglobin, the oxy/deoxyhemoglobin ratio can be calculated. Share Article:Facebook,   Twitter,   LinkedIn,   Google Plus,   Email,   Reddit,   Digg,   Delicious,   StumbleUponFollow iClarified:Facebook,   Twitter,   LinkedIn,   Google Plus,   Newsletter,   App Store,   YouTubeAdvertise Here

Source: iClarified Read More: The Apple Watch May Secretly Be Capable of Measuring Your Blood Oxygen Level