How many variations of the PGTA are there?
GT3505SH 3-1/2 dial face, 05 PSI range, with a set hand GT35015SH 3-1/2 dial face, 015 PSI range, with a set hand GT35015SH-SA 3-1/2 dial face, 015 PSI range, with a set hand, SA Pattern GT3505SH-CX 3-1/2 dial face, 05 PSI range, with a set hand, certified GT35015SH-CX 3-1/2 dial face, 015 PSI range, with a set hand, certified GT35015SH-SACX 3-1/2 dial face, 015 PSI range, with a set hand, SA Pattern, certified GT405SH 4 dial face, 05 PSI range, with a set hand GT4015SH 4 dial face, 015 PSI range, with a set hand GT405SH-CX 4 dial face, 05 PSI range, with a set hand, certified GT4015SH-CX 4 dial face, 015 PSI range, with a set hand, certified
