This freebie plastic one from Union Gear & Sprocket runs from 4 to 16 DP, no PA shown. It was given to me and I don't know where to find another one. They don't seem to have a working website.
I look for simple ways to identify stuff I wasn't expecting to find when all I have is the tools in the car, 4" dial calipers, a tape measure, a magnet and a 50 Lb fishing scale. They fit in a coat pocket and are cheap enough to risk losing. On treasure hunts I bring a Morse
1 - 2 sleeve to identify MT1, MT2 and B&S7 tapers. You can check if two tapers are identical by holding them together, facing opposite directions, and measuring across both ends.If you expect to break a gear, here's a gauge:
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I plan to keep them greased and NOT need it.
Jim Wilkins