I am getting ready to buy my first green laser pointer. I will be using this for work and play. what would be a good mw and company to go with. At work i will be using this to point at items i am discussing with my coworkers . Mainly in auto plants pointing at electrical pipe runs, air lines ,ductwork .....at ceiling level. also pointing at items outside on construction sites. I would like to see the beam and be able to play with this laser also . will one laser do this or is safety going to prevent me from being able to one laser for work and play.