I am building an CEB (like adobe) home and would like to buy a laser level to help make sure the top course is level. There is no roof yet, and this will be outside, and in the sun. The house is only ~20' x 20', so the furthest the laser will have to travel if we put it in the center is something like 14'. Will most rotating laser level points be visible at this distance? I've seen multiple different mw power levels for lasers. How far is each visible outside in the sun?