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People always need to go in life estimate the length or height of an object, especially some of the
People do related work, such as architects, carpenters and so on.
But in reality, the ruler is not too bulky, is too long, inconvenient to carry, and measurement
Sometimes the amount of process is particularly troublesome and their measuring range is always limited.
"L / H-Measuring" very small volume, the same can be like a ring worn on the finger everywhereTo measure, can also be separated to measure great distances, will be the people's favorite, "ruler."
Zhongyuan University of Technology