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Dial calipers are precision measuring devices used to measure linear dimensions, thickness, and diameter. These devices have upper and lower parallel jaws that perform measurement with extreme accuracy and the output appears on a dial display.
Dial indicators are capable of measuring small distances between two surfaces that a standard gauge cannot reach. These precision instruments translate the small linear distance into rotational movement and display the measurement on a continuous dial numbered clockwise around the face. Also known as test indicators, dial indicators are frequently used to measure machinery calibrations and equipment tolerances.
Outside micrometers are used for measuring the thickness or outside diameter of small parts or fittings with high accuracy. Similar in appearance to a C-clamp, the object to be measured is clamped between the anvil (the stationary end of the clamp) and the spindle (the moving part of the clamp). The clamp opens and closes by turning an internal screw. On analog micrometers, measurement is calculated by reading the lines and numbering system that appears on the thimble and sleeve.
Vernier calipers are unique in that they feature a main scale on the beam and a sliding vernier scale on the movable jaw to deliver precise measurements of outside dimensions, inside dimensions, and depths.