Calipers for measurement have been around for more than a century now. And today these have evolved into fully- featured digital systems for taking measurements. We can not deny the fact that the original design of a caliper was so versatile that this process of evolution required only a few changes to produce a digital caliper as we see it today. This process of the instrument evolving started with a second jaw been added in 1899. This allowed the users to take inside as well as outside measurement. Then came the vernier scales in 1951 which provided better protection. It was during the 1980s that the first digital readout of the measurement became possible which eventually brought in the ease of data collection. And today we can buy digital calipers with shop hardened electronics, improved scales that never loose their position and things like water proof digital calipers. But even today people buy digital calipers online or from the markets, and they still do it just to measure ou...