Mitutoyo Screw Pitch Gage, Series 188Precision is our Profession Mitutoyo Screw Pitch Gage, Series 188 Thread pitch size is stamped on each gage. Metric, Unified, and Whitworth screw pitch gages. Screw Pitch Gage, Series 188 Code Range # of Gages Price Metric 188 122 0. 4 7mm 21 1,800. 00 188 121 0. 4 7mm 18 1,700. 00 Inches 188 111 4 42 TPI 30 1,800. 00 Whit worth 188 101 4 42TPI 30 1,800. 00 188 102 4 60TPI 28 1,800. 00 Inches Metric 188 151 4 42 0. 4 7mm 51 3,800. 00