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Six-Module Gear Tooth Rack Gauge
This 130 x 50 x 3 mm card identifies the module of a stripped gear so you can model a replacement. Its two long edges carry 20° rack combs for modules 1, 1.25 and 1.5 (top) and 2, 2.5 and 3 (bottom), and you press each comb into the old gear until one meshes with no rock. The number of small holes beside each comb gives its module: 1 hole = m1, up to 6 holes = m3. Built for fan oscillator, mixer and blender gears. m1.25, m1.5 and m2.5 are close to 20, 16 and 10 DP.
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