:Go to vernier caliper and you can see one being used to measure a coin .-- ( talk ) 18 : 06, 27 October 2006 ( UTC)
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A diagram of "'vernier calipers "', a device used to measure the distance between two opposite sides of an object, showing the individual parts:
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Positive zero error refers to the fact that when the jaws of the vernier caliper are just closed, the reading is a positive reading away from the actual reading of 0.00mm.
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They are also trained to work with a wide array of precision tools, such as vernier calipers, micrometers, dial indicators, levels, gauge blocks, and optical and laser alignment tooling.
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This would be a simple calibrated caliper; but the addition of a vernier scale allows more accurate interpolation, and is the universal practice; this is the "'vernier caliper " '.
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For example, if the shaft of a lathe is angled slightly, the part will have errors in diameter far down the part . vernier caliper are not free from abbe error while screw gauge is free from abbe error.
