Most laser levels, except maybe a Hilti, are really pretty useless outdoors unless its dark out. Just not bright enough nor a sharp enough beam to see it well. They have those laser glasses but, well, they're pretty useless too. The manual-leveling one's are easy to get out of whack because people don't always set the level bubbles too well and that will get you several inches off in 25'.
Sometimes old school is the best. We use water levels for our job sites building decks and stuff. Just a 3/8" plastic clear hose filled with water to set the grade. Faster than you can set up the laser, and easily accurate within 1/8" or less for as long of a hose as you like. The water flows to level within the hose ends. Just move one end up and down to your target mark, and the other end follows. Easy and WAY CHEAPER than a laser and does not wear out or go out of calibration. Packs up really quick and you don't have to worry about it being stolen. I could calibrate a laser level using my water level, by the way. Its that good.
Steve
Steve[/QUOTI use the clear hose with water in it too to level long distances, I would just like to add I use unsweetened coolaid in the water to make it easier to see the water level and I agree it works.