Someone mentioned a laser
level, I have three different kinds that I use on every job. One is a simple 3 beam plumb
/level, small and light. Very quick for initial layout
finding. #2 is a 5 beam to establish and lay
out right angles and find points in relationship to two or three other points in one shot. #3 is a line
projector. instead of red dots, it shows a continuous line along the floor, up a wall or across a wall. They all do a different job better than the other two.
On the laser tool list of "must have" is a distance finder or laser tape measure. for both the Level
/plumb and the distance finders, 1/8" @100' is the tightest resolution you will need for 99.99% of install work, 1/4" @ 100' will handle most show rigging in arenas and outdoor situations. There are situations that need more accuracy, but they are in the minority. Remember, 1/8" @ 100' is 1/32" @ 25', that's pretty close. Can we do it closer? Of course! But it may take more time and do absolutely nothing to improve the product. If the guy who heads the gig says, "1/4 inch to the right" don't complain, just do it. That's what we're paid for. If you are the crew chief, make sure that 1/4" or 1/2" is really necessary or will make the product better. Will the crew's time be better spent on something else that WILL make a difference.