Graphical Construction Glossary >> Tools. >> Hand Tools >> Digital Caliper
The instrument above is a standard vernier gauge or caliper that has hardly changed in over a hundred years.
The Vernier is named after it's French inventor Paul Vernier. (1580-1767). It relies on the fact that the eye can only do very vague estimates of how far between two marks on a scale a pointer is, but when two scales are lined up and one of them has say 9 divisions and the other has 10 then the eye can clearly see the point where two of the marks are closest to touching and so get a far greater degree of accuracy.
I had a vernier gauge for years and I am by no means an engineer or did engineering work. It was just so useful for measuring bolts or other round objects. While the extreme accuracy I didn't need just the fact of getting to the nearest millimetre in many case was just too hard to do without it.
Often when taking a sample bolt into a store the guy behind the counter would reach for a vernier gauge to get it right. Many times I have seen them using cheap plastic ones that still do a great job.
1 - Outside jaws: used to take external measures of objects
The main points to be gained from this sketch is the fact that there are three possible measurements that can be made with all of these instruments.
The Dial Gauge is an improvement on the simple vernier gauge enabling professionals to make fast and east readings every time.
Once again an instrument that is easier to use and gives a greater degree of accuracy that other methods. Provided it is kept in good working order.
The digital caliper above measures from .001" to 6" or .01mm to 150mm. It calibrates to zero, and can change from mm to inches with the touch of a button
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