If there is no other method for users to get clear and quick line alignment, I would just like to recommend users the use of Berlinlasers green laser line generator. It is keeping direct green laser beam emission from 515nm green laser diode, owing to its direct green laser light targeting and good designed metal heat sink cooling system, it is just easily obtaining super stable and reliable line alignment result all the time.
This green laser line generator is available with much shorter wavelength than 532nm green laser, however, it still not affect laser light brightness in process of laser line alignment work. This green laser module generates highly straight and fine green laser line targeting, keeping the best line aligning distance of 3 meters. In addition, under condition that users are consisting on high accuracy line alignment, it is accepting maximum work distance of 25 meters. Users only need to make correct selection of output power and optic lens degree, this green laser module makes no mistake line alignment marvelously.
http://www.berlinlasers.com/515nm-5mw-50mw-green-laser-line-generator