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As measured with a caliper

Check the accuracy of the caliper, aligning the zero scale division

When performing carpentry or plumbing work required to regularly measure the different holes.

The usual range for this is not very suitable, since it is difficult to measure, such as a recess.

In addition, it provides accuracy up to 1 mm, and this is not always enough.

For more accurate measurements applied caliper which allows to determine the internal and external dimensions of up to 0.1 mm.

You will need

  • Calipers
  • The item to be measured
  • vise



Consider caliper. The most common of these consists of a rod with jaws. Sponges still. At the bar there millimeter scale. Its length is 150 mm. By moving the rod frame on her lips moving. Movable jaws positioned on an auxiliary scale 19 mm. It is divided into 10 equal parts, the distance between the markings 1, 9 mm. This convenience is called a vernier scale. Before measuring, check the accuracy of the caliper, aligning the jaws. Zero marks of basic and additional scales should coincide, and the tenth of the scale bar more aligned with the main nineteenth stroke. Caliper measures the depth of the hole and, for this purpose on the back of the bar there is depth.


Secure the item in a vise. If the grip is not, fix it in any other way, so it does not move, otherwise the measurement will be inaccurate.


To measure the external parameters sweep detailfixed and movable jaws. Lightly press the sponge to the details, not to cause mechanical damage and break caliper. Secure the sponge retaining screws.


Look, with what division of the main scalecoincided first vernier risk. This division represents the number of whole millimeters details. Look where both scales risks accurately aligned the next time. Count on the vernier division. This number denotes the tenths of a millimeter, it is necessary to add on to the number of whole millimeters.


Internal parameters are measured by another pair of jaws, which are inserted into the recesses. Counting is carried out in the same way.

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