Use of Granite in Metrology

Granite in MetrologyGranite in Metrology

GMT’s METROLOGY DIVISION has been in the field of Metrology for the past 60 years, and have made granite products for about 30 years.  We specialize in the use of granite in Metrology for design, development and manufacturing of all sorts of dimension reference products.

About Metrology

The famous British physicist, Lord Kelvin said, “I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind;.”  This emphasizes the importance of precise measurement, which is the basis of repeatability, which, in turn, is the cornerstone of mass production.

All engineers, regardless of their branch of specialization, have to validate their work, using measurements. The results govern the next step in the process of producing parts. All such measurements form part of Metrology. Essentially Metrology is the science of measurement.

Mechanical and production engineers are, however, especially concerned with the measurement of length and it’s derivatives, angle, surface, etc. In order to do this, they need a very stable reference. To measure any three-dimensional object, you need a zero point or plane. While many materials like cast iron are suitable, for very high precision measurements, granite is the best. It has a very low temperature coefficient of expansion. This means the reference remains stable with time, and many such advantages. For more details, please see

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