So for a vernier with a constant of 0.1, each mark on the vernier is spaced 9/10 of those on the main scale. The vernier scale is constructed so that it is spaced at a constant fraction of the fixed main scale. The use of the vernier scale is shown on a vernier caliper which measures the internal and the external diameters of an object. Vernier caliper scale with the normal 0.02 vernier constant, showing measurement of object at 19.44 mm to two decimal places The Vernier principle of interpolation is also used for electronic displacement sensors such as absolute encoders to measure linear or rotational movement, as part of an electronic measuring system. Examples are calipers and micrometers to measure to fine tolerances, on sextants for navigation, on theodolites in surveying, and generally on scientific instruments. A vernier may be used on circular or straight scales where a simple linear mechanism is adequate. Such an arrangement can go to a higher resolution by using a higher scale ratio, known as the vernier constant. The interpolated reading is obtained by observing which of the vernier scale graduations is coincident with a graduation on the main scale, which is easier to perceive than visual estimation between two points. The vernier is a subsidiary scale replacing a single measured-value pointer, and has for instance ten divisions equal in distance to nine divisions on the main scale. It may be found on many types of instrument measuring linear or angular quantities, but in particular on a vernier caliper which measures internal or external diameter of hollow cylinders. The 0.02 mm engraving indicates the caliper's readability and is the "vernier constant" for this scale.Ī vernier scale, named after Pierre Vernier, is a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation, thereby increasing resolution and reducing measurement uncertainty by using vernier acuity to reduce human estimation error. The vernier reading is found by locating the best aligned lines between the two scales. The main scale reading is that to the left of the zero on the vernier scale. It reads 3.58 ± 0.02 mm by adding 3.00 mm (left red mark) on the fixed main scale to vernier 0.58 mm (right red mark). We also offer an in-house calibration service.Vernier caliper scales main at top, vernier at bottom. Our range of depth gauges is of the highest quality, available in analogue and digital variants, sourced from leading brands such as Mitutoyo, Starrett, and RS PRO. You can also use them to measure and locate centre distances.Why would you choose RS for depth gauges?We support engineers with the best in class linear measurement devices. Ensure the slide is perpendicular to the base for a true reading.ApplicationsAnyone doing construction or remodelling work and in need of accurate measurements of the depth of a slot, hole or recess will find a mechanical depth measurement tool handy. To operate simply place the depth gauge inside the hole or slot to be measured then move the ruler and the slide down until you reach the mating surfaces. These type of depth gauges allow the user to obtain additional precision measurement readings using this principle.How do they work?Depth gauges are effectively made up of two components, a measuring ruler and a slide head that has a flat base. Normally battery powered by a coin cell battery such as an SR44 or similar.Vernier depth gauges use the Vernier scale. Digital depth gauges require an additional power source to work. Gauges can be analog, digital or Vernier type gauges.Analog depth gauges or dial depth gauges have a dial and a needle indicator that shows the depth measurement on the face of the dial.Digital depth gauges use a digital display that shows the depth measurement in a numerical format. Some models offer dual options showing both imperial and metric measurements. So, if you are looking for a depth gauge, we undoubtedly will have the ideal solution to meet your needs.Types of depth gaugesDepth gauges have measurement scales in inch or metric (millimetre) values. These gauges are simplistic in their design and easy use. Using a ruler and eyeballing the depth is a technique from the past, depth gauges are the right way to go. Depth Gauges Achieving an accurate reading of a component depth can be somewhat frustrating without the right tool.
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