Fowler Involute Gear Tooth Gage52-470-140

With this Involute Gear Tooth Gage, it is easy to determine the diametral pitch of involute gears from 680 and 25 in inch and .55 and 612 in metric.
14 leaves with ring holder.
Range of pitch: 6, 7, 8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 36, 40, 48, 64, 80
Pressure angle = 14.5.