The device measures blood pressure through several sensors which simultaneously measure the contact pressure, pulse and blood flow on the surface of the skin in the vicinity of the wrist.
Yes, Sir Isaac Newton is best known for his work on gravity. He also worked on and discovered many other scientific wonders during his lifetime (1642-1727).
Another influence to Isaac Newton was Galileo. You see Isaac Newton was born on the year that Galileo died. At that time Galileo was known really well.