When you need a gauge to check diameters on a turning project, you don’t ordinarily reach for a wrench.

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Wrench

When you need a gauge to check diameters on a turning project, you don't ordinarily reach for a wrench. But open-end wrenches make handy gauges for checking small diameters because, unlike calipers, there's no need for setting and resetting the jaws. For example, have 58 ", 12 ", 38 ", and 14 " wrenches ready for gauging the diameters when you're turning a finial or tenon. Lightly touch the wrench to the turning. When the wrench slides easily over the workpiece, you've reached the desired diameter.
—from the WOOD® shop