What is a feeler gauge used for?

Measuring the space between two surfaces

Explanation

A feeler gauge is used for measuring the space between two surfaces. Feeler gauges measure the gap width between two interior surfaces, typically the clearance between two parts. It consists of a number of small lengths of steel of different thicknesses with measurements marked on each piece. These pieces are inserted into the gap either individually or stacked upon each other until their thickness matches that of the gap.

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