concept of design

    The common laser pointers project only a single point. If changing it into this laser diode, we just use it to underline the whole sentence on the screen not just a point.

    The most function is that helps us draw straight lines easily without rulers.
 

    You can project the laser beam to any flat surfaces and adjust it to change the length of lines.
  You can even add more than one laser diodes if you want to draw other shapes like triangles or squares, and adjust it to make the shape bigger or smaller
This design is not only for drawing straight lines or shapes but also can replace the laser pointers in the remote control.

Only a dot

Line

Use in math class

Use in English , music class