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I invent tools for myself Ive not seen or improvements to available ones.   These are two different gauges I've come up with.

The pin with the white head has a hairspring collet as a stop. You can measure and transfer the length or depth of the work on a micro scale. It works really well for lengths of arbors while turning.

The other two taper pins are made from sewing needles turned down. You use a permanent marker or ink marker to darken the needle. GENTLY put it into a jewel or a bushing and twist a couple of times. This will make a witness mark you can then pull out and measure the diameter of where it falls on the pin. You can see in the image where the ink was rubbed away at the tips. You would measure the shiny metal right where the ink stops to get your hole diameter. 

Both of these easy to make tools have helped me out many times.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

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Edited by Sjk4x4
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