6 Types Of Sublenses And What They Are Used For

Do you want to complete the tool kit with a subler, but you need to be sure to choose a suitable model for the projects you are working on? Find out in this article which are the most popular models and for which operations they are recommended.


Emphasis is generally used to measure the distance between two points on the body of an object. The measurement is made by fixing the two arms on the targeted points and reading the result either directly from the subler, if it includes the graduated scale or digital display, or fixing the distance between the arms and comparing it with an external, reference scale.


Areas of use

Although the structure and technique of use the subler is a very simple instrument, it is among the essential measuring devices in many fields, including metrology, wood and metal processing, engineering and science. Adapting to the specific requirements of the measurement tasks that it is put in the situation to fulfill, the subler is currently available in several forms.


Interior subler

As the name suggests, in this case the role of the subler is to measure the internal dimensions of an object (eg the diameter of a pipe or channel obtained by milling). These models have elongated, straight arms, with slightly curved ends to the outside, fastened with a screw that allows their pivoting and framing in the evaluated space. Although the Vernier type variants are the most used today, an interior subler will help you when the points between which you have to measure are located at a greater depth than the standard Vernier arms.


Exterior variants

If there are sublenses for measuring the interior of an object, of course, models have been designed to allow the most accurate assessment of its external dimensions. These technical variants are called exterior sublenses. Unlike the format discussed above, the structure of this type of sublere includes curved arms, with the concavity inwards, similar to an oversized pliers head. This design allows the easy and fixed framing of the measured object, the outer sub-being being generally recommended for the evaluation of objects of medium thickness.


Subler divisor

Also known as a compass, the divider subler is provided with two straight arms, finished with a sharp tip, which allows the creation of marks on metal or wood, by lightly scratching the material. It is used in metallurgy to measure long distances and can also be used to sketch arcs of circles or complete circles with a certain radius.

It is just as useful for measuring the distance between two points on a map. The tip of an arm is fixed on one of the targeted points and the other arm extends to the second point of the measurement. The distance between the two arms is then measured using the scale printed on the map or an external one.

A lesser known application of this measuring instrument is to evaluate the distance of the segments created on the EKG, in order to find out as accurately as possible the amplitude of the heart rate.

The bent arm subler is a special shape of the divider, designed to allow the measurement of distances from the edge of an object. The bent arm allows the placement of the subler with precision, on the end of the analyzed element, in which the right arm can be easily oriented towards the end point of the measured distance.



We can’t say for sure that it is the best subler , but it is definitely the most popular format. Unlike the models discussed so far, the classic Verniersubler consists of a base or long handle on which is inscribed a graduated scale, in centimeters or inches, depending on the country of origin and destination, and two pairs of arms located by one side and the other of the scale.

The first pair of arms is longer, one is fixed and one is mobile, the last one sliding on the scale to allow the measured object to be framed from the outside. The arms have a straight interior, for a precise grip, and a slightly angled exterior.

The second pair of arms is smaller, it also consists of a fixed component and a sliding one, but this time the arms have a straight outer side and a curved inner side, being used to measure the inside of an object.

Both movable arms are usually provided with locking elements, which allow the reading of the dimensions after the measurement has been made. The subler also includes the Vernier scale, which in the case of the metric system means divisions of 0.1mm or 0.02mm.

The structure of such a subler is also provided with a probe, attached to a moving head, intended to evaluate the depths.

These models are resistant to shocks and the effects of electromagnetic fields and offer very good measurement accuracy, but can be difficult to read in low light conditions or stressful situations.


Digital models

The digital versions are similar in structure to the Vernier sub-lines, but also include an electronic screen that directly displays measurements, with a division of up to 0.001mm, an accuracy level that recommends them for areas where data as accurate as possible is needed. 

Most products offer the possibility to establish the origin or zero point, at the beginning of the measurement, and to save the obtained result. Some options also provide data transmission to the computer, thus making it much easier to record consecutive measurements for various scientific projects.



The micrometer is in turn a micro subler model, which uses a calibrated screw to perform the measurement, instead of a linear scale. It is usually used for small objects and precision measurements, in metrology and engineering, and is available in two variants: classic or mechanical, and digital.

Its structure includes a C-shaped frame, which includes the object to be measured, a screw, whose rotational movement is translated into linear dimensions, using a fixed scale and a cylinder containing millimeter divisions. The micrometer is completed by a handle that allows it to be held in a horizontal position.


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