This device also makes {HEAD ~ possible measurement} of the gap for {TAIL ~ the profile base} indirectly on line 
This device also makes { HEAD ~ possible measurement } of the gap for { TAIL ~ the profile base } indirectly on line
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH