Laser grid pen

Another piece of equipment we can use on an investigation is the laser grid pen.

The laser grid pen projects a highly focused array of points of light.

You would set up the laser grid shining at a wall and observe the pattern projected.

The idea is that anything that passes between the laser source and the wall that it projecting against will effect the observed pattern.

This can be useful to see movement in a room without actually seeing the entity, but rather the effect they produce.