If you are not able to get clear enough dot measuring result at long work distance, you should have a try of Berlinlasers green dot laser alignment. It is a quick working dot targeting tool after its quite easy connect with external electric power source from DC input power supply. This 532nm green laser module gets quite nice thermal emitting and wide range environmental stabilization, which is always able to get quite stable and reliable green laser dot targeting in all kinds of industrial machinery processing works.
This green dot laser alignment gets the best use of APC driving circuit, under condition that internal part of crystal lens part and electric driving circuit are perfectly protected, it is just keeping constant output power supply all the time. Users can make quite easy adjustment of laser beam focus and laser dot targeting tool, under condition that it is being used by skilled users or professionals, it gets the clearest dot instruction for laser marking machine, drilling device, button positioning device etc.
http://www.berlinlasers.com/532nm-green-dot-projecting-laser-alignment