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.
Arteries that are relatively large and near the surface can be used as pulse sites.
Femoral and carotid
Feel for the main vein just below the ear
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.
Palpable pulses are the tangible heartbeats that can be felt in various arterial sites throughout the body, such as at the wrist and neck.
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.