{HEAD ~ Apparatus} and method for verifying {TAIL ~ the coplanarity} of a ball grid array 
for verifying
{ HEAD ~ Apparatus } and method for verifying { TAIL ~ the coplanarity } of a ball grid array
HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH