A holder for securely positioning a sensor on a protruding part of a human body, which sensor includes a light source transmitter and a receiver sensitive to {HEAD ~ radiation} emitted by {TAIL ~ the transmitter}, comprising: 
emitted by
A holder for securely positioning a sensor on a protruding part of a human body , which sensor includes a light source transmitter and a receiver sensitive to { HEAD ~ radiation } emitted by { TAIL ~ the transmitter } , comprising :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH