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There are three measuring movements when using Vernier calipers gaining the measure value on the measured item; gaining the measure value by eyes; reading the value.

But these measuring movements can't be so quick. We have to be very careful when we come to measure again. Then the time should be stable for measuring.

The three measuring movements mentioned as above, continuously and synchronously process under a fixed order. Once the measuring movement over, the Vernier caliper has the measure value for reading. Gaining the measure value and reading both are the subjective goal of the actor. However, the he process of gaining the measure value is the unchanging feature of the Vernier caliper.

If we want to speed up the measure movement, it is necessary to provide the appropriate form of displaying the measure value, and provide the method of reading the measure value. Below please find the methods of reading the measure value: Vernier film and long scale, gear rack, measuring parts and round scale, LED display, etc.

For the thought of simplifying the reading method on a Vernier caliper, it can be traced back to the last century. By 1950 the need for using the dial calipers had been widened. Dial caliper with 0.05mm min reading certainly became the first group high efficient caliper, which met the producing requirement at that time. This kind of caliper had light yellow lines on a black ground, thus enhanced the compare ratio when reading. However, the real most famous Dial calipers had come to be the one with 0.02mm min reading. In order to avoid error, the machinery counting Dial caliper came to birth. The counter pointed to the integral number so showed the measure value. And get the min reading 0.02 on the round dial plate. In 1980, there came a kind of such caliper with min 0.01mm reading and max measuring range of 100mm. Subsequently, it was designed to have the shock-proof function.

Firstly, Dial caliper is 2-3 times expensive than vernier caliper, meanwhile, it less 1/2 and 1/3 than Digital caliper. Secondly, for the reading speed and reliability, the average measuring time of Dial caliper is 60-75% more than Vernier caliper's. According to the measure value is very clear, so it is hard to appear the reading error.