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• Golden Ratio Calipers

• These equal spacing calipers are not very accurate, because error can accumulate across the many joints. But they’re fine for woodworking, painting, carving, and of course button placement.

• This is an iris mechanism, like the ones you find inside camera lenses, but sold as a variable circle-drawing template. The leaf vanes open and close when you rotate the outer rim. Very fun to play with, maybe not so useful for drawing circles.

• This magnificent equal spacing divider prevents slop by supporting all the points back to a common origin. It is smooth and very satisfying to open and close.

• These large old calipers can be used for inside or outside measurements.

• Golden Ratio Calipers

• Golden Ratio Calipers

• For some reason golden ratio calipers are mainly advertised to help you achieve the perfection of ancient Greek architecture in your makeup and tattoos.

• Compass Calipers

• Wire Profile Gauge

• Dividing Caliper

• These calipers let you choose a ratio, lock it in, and them transfer many measurements from one scale to another.

• Dozens of individual sliding segments mold themselves to the shape of, for example, a piece of wood trim you need to fit around. A lever locks them in place so you can capture and transfer the shape. The wire ones have more resolution, but the plastic ones don’t rust.

• Transfer calipers come with three kinds of jaws: pointed in for outside measurements, pointed out for inside measurements, and straight for measuring positions on flat surfaces.

• Wire Profile Gauge

Do you have a better example of this kind of tool? Let me know by leaving a comment, and include a picture of it if you can so everyone can see!