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P-Ruler
P- Ruler is a new measuring tool, designed for building purposes and decorating exhibitions. With simple principles of optics, the projector shows data of a ruler on the wall or ground. It means you can get information of targets about length, angles, and distance immediately.
The way to use is really easy, you just need to turn on the flashlight and point to the object, then you get data. When it comes to realizing this theory, it can be implemented. After receiving the reflected infrared ray, it will adjust the focus by itself and keep the size of calibration of the ruler fixed.
