P-Ruler / Measuring tool

P- Ruler is a new measuring tool, design for building purposes and decorating exhibitions. With simple principle of optics, the projector shows data of ruler on the wall or ground. It means you can get information of target about length, angle, and distance immediately.
The way to use is really easy, you just need to turn on the flashlight and point to the object, than you get data.
When it comes to practice site, it can be real. After receiving the reflected infrared ray, it would adjust the focus by itself and might keep the size of ruler’s calibration in fixed.