More particularly, the present invention relates to apparatus and method for verifying the coplanarity of {HEAD ~ a ball grid array} on {TAIL ~ a semiconductor device} 
More particularly , the present invention relates to apparatus and method for verifying the coplanarity of { HEAD ~ a ball grid array } on { TAIL ~ a semiconductor device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL