The Laser can only function at detecting objects if used with a Laser Detector. The Laser emits a thin, red beam which does not hurt the player on contact. The beam being emitted can be blocked by the player or any item including wood.
It is more effective to use a Signal Inverter when using a Laser with a Laser Detector as that means there will be an output when the beam is being blocked by an object. This can be effective in a scanning machine as there will be a signal telling the player when there is an object where the Laser is.