Things You'll Need
Metric feeler gauge
Correct measurements of any tight tolerances are a necessity to ensure the proper operation of your mechanical and electrical equipment. Feeler gauge blades have the width -- in metric or standard units -- of the blade stamped near their base. When using a feeler gauge with only metric sizes stamped on the blade, you can still determine the standard size by converting the metric dimension. A simple mathematical equation allows you to precisely convert a metric dimension to a standard equivalent.
Slide one blade of a metric feeler gauge into a mechanical gap to determine the gap width. The correct blade will slide into the gap while slightly contacting the top and bottom of the gap.
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Read the number stamped on the bottom of the feeler gauge blade matching the size of the mechanical gap.
Enter the metric measurement into a calculator. Multiply the metric number by 0.039 to convert the metric dimension to standard units. For example, a feeler blade 3 mm thick multiplied by 0.039 equals 0.117 or 3/32 inch.