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Micrometers are instruments for mechanics and engineering Pros to take readings that would otherwise be too small to tell by sight.

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Standard micrometers have three scales that measure 0.1 inch, 0.025 inch and 0.001 inch, respectively. Knowing how to read a micrometer begins with the two larger scales on the sleeve and finishes with the smaller scale on the dial or thimble.

When a micrometer is at the minimum setting, the horizontal line on the sleeve should align with the 0 on the thimble. If they do not line up, calibrate the micrometer with these steps:

Learning how to read a micrometer allows Pros to find exact measurements for installation or repairs. Accuracy is key to professional work, so precise measuring instruments like micrometers can be essential.

There are measurement scales on both the sleeve and the dial of the micrometer. The following steps review how to read a micrometer in inches.

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In the example presented on the diagram, the last whole number on the sleeve is 3, followed by three quarter marks (0.075) and a 6 on the thimble. The measurements would be:

Keep the surface of your micrometer clean of oil, dust or dirt to ensure a precise measurement. Use a soft cloth or dust rag to wipe down the spindle, anvil and measuring faces of the micrometer before and after use.

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Store the micrometer at room temperature and make sure the anvil and spindle are separate in the open position. Do not store micrometers with the anvil and spindle in contact.

Pros depend on tools that can make exact measurements. Micrometers measure in increments of 0.001 inches (or 0.01 mm) for such precise readings as the thickness of washers, the width of bolts and more. This guide reviews the basics of micrometer reading.

Read the whole number on the sleeve first and then the quarter marks. If the whole number is a 3 followed by two quarter marks, the measurement is 0.350 inch. If the number is a 5 followed by three quarter marks, the measurement is 0.575 inch.

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Know the difference between calipers vs. micrometers when making measurements. Calipers can take internal or external measurements as well as depth and thickness. They are known for versatility, range of size and ease of use. Micrometers are similar, but are designed for more specific, accurate and at times smaller measurements.

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