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2. Micrometer (device) - Wikipedia

   en.wikipedia.org/wiki/Micrometer_(device)

   A micrometer, sometimes known as a micrometer screw gauge (MSG), is a device incorporating a calibrated screw widely used for accurate measurement of components [1] in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers.

3. Vernier scale - Wikipedia

   en.wikipedia.org/wiki/Vernier_scale

   A vernier scale (/ v ə r ˈ n iː ˈ ə r / ver-NEE-er), 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 ...

4. Least count - Wikipedia

   en.wikipedia.org/wiki/Least_Count

   A vernier scale on a caliper may have a least count of 0.1 mm while a micrometer may have a least count of 0.01 mm or 10 microns.

5. Bore gauge - Wikipedia

   en.wikipedia.org/wiki/Bore_gauge

   An inside micrometer or vernier bore gauge measures a bore directly. The gauge has three symmetrical anvils that protrude from the gauge body that are connected to the dial or micrometer mechanism. As the knob is rotated it moves the anvils in or out with respect to the measurements.

6. Calipers - Wikipedia

   en.wikipedia.org/wiki/Calipers

   A vernier caliper clamping on an object. Calipers or callipers 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.

7. Traveling microscope - Wikipedia

   en.wikipedia.org/wiki/Traveling_microscope

   A metallic carriage clamped to a spring-loaded bar slides with its attached vernier and reading lens along an inlaid strip of metal scale. The scale is divided in half millimeters. Fine adjustments are made by means of a micrometer screw for taking accurate reading. Both vernier reading to 0.01mm or 0.02mm.