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