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