{TAIL ~ a height detector} for detecting a height of a surface of {HEAD ~ an object} to be inspected 
{ TAIL ~ a height detector } for detecting a height of a surface of { HEAD ~ an object } to be inspected
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH