Med-Watch measures health data like heart rate, Blood Pressure through (PTT)also known as Pulse Transit Time via optical heart rate sensor at the back.
Pulse Transit Time detects the time it takes for a pulse to travel from the heart to the wrist. Based on which it shows the blood pressure readings. If the blood pressure is high, the pulse transit time is faster and if the blood pressure is low, the pulse transit time is slow.
It is also recommended to stop the blood circulation for a while with a strap or cuff to measure the blood pressure accurately. This allows the force required by the heart to pump blood around the body.