Laser level: A tool that projects a laser light beam, providing a straight referral line for positioning functions

https://www.evernote.com/shard/s623/sh/33a8eaab-a497-7133-7021-8b0b419250c5/0wgXozx2ZtqJxC8y3IFGxLD7K2rIgVx4cM10VLrVmKO6EWOomh6bI4w_OQ

Laser degree: An instrument that projects a laser light beam, giving a straight reference line for alignment purposes