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Vernier Calipers are instruments that are used measure length. It is an instrument that provides a digit of accuracy.
Tools for measuring lengths are : Screw gauge, vernier calipers,drafter, ruler ,circular scale ,etc . These tools are used for measuring lengths according to their different least counts.
The correct spelling would be vernier callipers, or vernier calipers depending on which country you come from. They are used for measuring the inner distance between two surfaces. (e.g. if your tube material is 1 cm thick, and 5 cm across on the outside surface, the vernier calipers would show a distance of 3 cm.
A set of calipers.
Bow Calipers is a device used to measure the distance between two opposite sides of an object.
Inside and outside calipers are used for this.
Lengths or distances.
Rulers, tape measures, calipers.
millimetres, and fractions of an inch. microscopic levels are microns or micrometres (1/1,000,000 of a metre), nanometres (1/1,000,000,000 of a metre), and picometres (1/1,000,000,000,000 of a metre)
Vernier calipers are used to measure length when quite accurate measurement is required, but not such accuracy as to require a micrometer.
Rulers are used to measure lengths/distances.
Tape measure: used to measure distances and lengths. Scale: used to measure weight or mass. Thermometer: used to measure temperature. Ruler: used to measure small lengths or distances. Stopwatch: used to measure time or duration.