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