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The standard for a caliper is usually a constant of 0.02 Vernier caliper scale with the normal 0.02 vernier constant, showing measurement of object at 19.44 mm to two decimal places. The use of the vernier scale is shown on a vernier caliper which measures the internal and the external diameters of an object.
A vernier caliper clamping on an object. Caliper(s) or calliper(s) are an instrument used to measure the linear dimensions of an object or hole; namely, the length, width, thickness, diameter or depth of an object or hole. The word "caliper" comes from a corrupt form of caliber. [1] [2] [3]
A tree caliper is a tool to measure the diameter of a tree. When used in forestry, the tree caliper tool measures the DBH or "diameter at breast height" of a tree that is growing in a landscape of any kind. The measurement is generally made at 4.5' or 1.4m above the soil.
English: Illustration of a vernier caliper. The caliper is showing a measurement of 2.475 cm ± 0.005 cm. Legend: Outside jaws: used to measure external length; Inside jaws: used to measure internal length; Depth probe: used to measure depth; Main scale (cm) Main scale (inch) Vernier (cm) Vernier (inch) Retainer: used to block/release movable part
A diagram of vernier calipers, a device used to measure the distance between two opposite sides of an object, showing the individual parts: Outside large jaws : used to measure external diameter or width of an object
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Tree caliper – two prongs connected to a measuring tape or stick are placed around the most average part of the bole to determine diameter; Relascope – multiple-use tool that is able to find tree height, basal area, and tree diameter anywhere along the bole; Clinometer – common tool used to measure changes in elevation and tree height