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