A further object is to describe {HEAD ~ an apparatus} that does not require {TAIL ~ a complex housing}, known from the existing art, for the cylindrical sensor head in order to mechanically connect the sensor head to a holder in oriented but nevertheless axially displaceable fashion 
A further object is to describe { HEAD ~ an apparatus } that does not require { TAIL ~ a complex housing } , known from the existing art , for the cylindrical sensor head in order to mechanically connect the sensor head to a holder in oriented but nevertheless axially displaceable fashion
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH