Mitutoyo 188-102 Whitworth (BSW) Screw Pitch Gauge 4-60 TPI

Thread pitch size is stamped on each gauge.
Composition of leaves Unified: 4, 4.1/2, 5, 6, 7, 8, 9, 10, 11, 12, 13 14, 16, 18, 20, 22, 24, 25, 26, 28, 30, 32, 34, 36, 38, 40, 48, 60 TPI. (28 leaves).