Sunday, March 3, 2024

Introduction to Indoor Gauges

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The caliber It is one of the most widely used measuring tools in mechanical work, and for precision work measurement. They are used for external measurements, internal measurements and depths. The caliber it has a graduated rule called a vernier through which you can see the value being measured. Currently, gauges digital are the most used.

The gauges Interiors are used to measure grooves or internal diameters, as the name implies.

Parts of a Gauge

The caliber has several elements to measure objects, which are described here:

  • The ears are used to measure the inside faces of the pieces.
  • The jaws are used to measure the volume of the same inner faces of the pieces.
  • The rod that comes out at the bottom of the gauge is used to measure the depth of objects.
  • The locking and unlocking nut allows the gauge to slide and fix it during the measurement of the piece.
  • The gauges digital, it also has a button to reset it (it can be reset in any position), and a button to go from millimeters to inches.

How a gauge works

The ears are two elements that allow to measure the interior diameters, the interior faces and, in general, interior geometric shapes. The locking and unlocking nut is used to adjust the vernier once the measurement is achieved: by turning the nut to the right, the vernier will be automatically locked and we will obtain a more accurate reading. Turning the nut to the left unlocks the vernier, leaving it free again.

Types of indoor gauges

  • Turner gauge: This gauge is only useful for measuring exteriors and interiors, as it does not have a probe (a rod used to measure depths).
  • Universal gauge with dial gauge: It has two pointed ears for interior measurements, and a jaw that also ends in a point. Thanks to its special probe, with this gauge we can also measure depths. We could say that this is a common caliber, with the peculiarity of having a comparator watch for a different measurement.
  • Blade Type Inside Gauge: their jaws are blade-like and long. This allows us to take interior dimensions in depth. The length of the jaws is around 50 to 90 mm, depending on the model.
  • Inner gauge with blade contacts: Due to the special shape, it is used to measure grooves.



  1. To measure inside: for inside diameters, read the scale while the indicated value is at its maximum; for the width of a slot read the minimum.
  2. Select the calibrator that best meets your measurement needs.
  3. Do not use great force on the gauge while taking the measurement.
  4. Take care not to damage the indoor test tips.
  5. Before use, remove all dirt (dust, lint, etc.) from the gauge.
  6. During the measurement, the cursor should not be slack. Correct and tighten the set and precision screws.
  7. In the case of using digital gauges, the batteries must be in good condition, otherwise they will not indicate actual measurements.

If you want to know more about gauges, don’t miss the article caliper caliper and Starrett’s virtual training module

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