These feeler gauges make quick work of measuring your fingerboard slot width. Get the whole set and use them as go/no go gauges.
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Product Description
When installing the battery do not just drop it in, make sure it is firmly inserted in front of the battery clip or your gauge won't function correctly.
Video: LMI Digital Depth and String Height Gauges.
Turn on, place on a flat surface with tip flush with the base
Press the button to set the tool to zero
Set the slider tip on the detail to measure and place the base on the reference surface
The displayed value is the distance from the bottom of the base (zero) to the detail