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The L. S. Starrett Company is an American manufacturer of tools and instruments used by machinists, tool and die makers, and the construction industry. It claims to produce 5,000 variations of precision tools, gauges, measuring instruments and saw blades as of 2025.
This would be a simply calibrated caliper, but the addition of a vernier scale allows more accurate interpolation and is the universal practice; this is the vernier caliper. Vernier, dial, and digital calipers can measure internal dimensions (using the uppermost jaws in the picture at right), external dimensions using the pictured lower jaws ...
Foreign body spud and needle: Spud to remove superficial and needle for the deep foreign bodies in the eye Elliot's trephine with handle: used in corneal donation (eye donation) to cut out the cornea in a circular fashion Castroveijo's calipers: various measurements are taken Castroveijo's corneal trephine
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.
The Torrington Company was a firm that developed in Torrington, Connecticut, originally called the Excelsior Needle Company. It was formed in 1866 around the new idea of using a "cold swaging" technique to create better sewing machine needles , as Torrington expanded, it began to produce other goods.
When using a micrometer to set a dial bore gauge, the accuracy of the measurement will be 0.002 inches or 0.0508 millimeters. A ring gauge can be used to obtain higher accuracy at a higher cost and higher time requirement. When a dial bore gauge is set using a ring gauge, overall accuracy can be within 0.0001 inches or 0.00254 millimeter. [2]
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.
The Birmingham gauge ranges from 5/0 or 00000, the lowest gauge number corresponding to the largest size of 0.500 inches (12.7 mm), to 36, the highest gauge number corresponding to the smallest size of 0.004 inches (0.10 mm).
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