The carotid artery in the neck and the radial artery in the wrist.
There are several sites that one can find more information about pulse oximetry. These sites include the pulse oximetry page of Wikipedia, World Health Organization, and Pulse Ox.
factors affecting pulse rate-raising or lowering pulse sites on the body
This site is called a pulse point. There are ten sites that are used.
The most commonly used pulse sites are the radial artery located in the wrist, the carotid artery in the neck, and the brachial artery in the elbow. These pulse sites are easily accessible and are often checked to assess heart rate and rhythm.
Arteries that are relatively large and near the surface can be used as pulse sites.
Femoral and carotid
As you go farther away from the heart the arteries differentiate into smaller arterioles. As a result the elastic recoil of the arterial wall lessens and the perceivable intensity of the pulse also lessens.Hope this answered your question.
Carotid (in the neck)
The main feature of a pulse monitor is, of course, measuring the pulse of the person wearing it. Another feature is to then display this value as both a number and a graph on another machine.
one of the main arteries run threw the thigh.
Apparently the foot is the main place but am not certain.
A pulse can be felt where an artery crosses a bone. The main areas where the strongest pulse may be felt are the carotid artery in the neck, the brachial artery in the crook of the arm and the radial artery in the inner wrist.