Abstract: A device for the angularity of a hole has a housing, a pivotally movable probe, and a digital display for displaying angular deviation of the probe from a home position. The device can additionally or alternatively have a signaling device to signal angular deviation of the probe past a predetermined angular deviation.

Abstract: A retro-reflective target tape comprising a lower sub-laminate having an upper transparent thick mylar backing about 2 mils thick, a release sheet therebeneath and a pressure sensitive adhesive therebetween; and an upper sub-laminate having an upper light reflective sheet with a thin, transparent mylar backing about a half mil thick therebeneath and with a pressure sensitive adhesive therebetween and with pressure sensitive adhesive beneath the thin mylar backing, the upper sub-laminate being cut to form a plurality of circular reflective targets and removed from the lower sub-laminate except for the plurality of circular reflective targets, the pressure sensitive adhesive above the release sheet remaining with the thick mylar backing upon the removal of the adjacent release sheet. Also disclosed is a method of fabricating such tape.