Feeler gauge

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A feeler gauge is a tool used to measure gap-widths or the distance between two parts.

A set of feeler gauges consists of several small lengths of steel of different thicknesses with measurements marked on each piece. Some feeler gauges will have measurements marked in inches, some will have measurements marked in millimeters, and some will have measurements marked in both inches and mm.

Feeler gauges are commonly used to measure the distance between the points (the point gap) on mopeds.

Common substitutes for store-bought feeler gauges include pieces of cardboard boxes or guitar picks (which are often marked with a thickness measurement in inches or mm.)

  • Cardboard feeler gauges (taken from Fred's Guide):
    • a macaroni and cheese box is.................. .018"
    • or a Girl Scout cookie box is.................... .016"
    • or a small breakfast cereal box is about......... .016"
    • large breakfast cereal boxes are................. .020"
A set of store-bought feeler gauges