- 1). Wet a rag with mineral spirits and swipe the feeler gauge clean. Oil and dirt buildup can greatly affect the thickness of a feeler gauge.
- 2). Dry the feeler gauge with a microfiber rag to remove any mineral spirit residue from the feeler gauge.
- 3). Measure the thickness with a calibrated zero-to-one micrometer. To do so, position the tip of the feeler gauge between the base and anvil of the micrometer and rotate the dial clockwise to close in on the gauge. Take the reading from the micrometer.
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