Whenever you are trying to get clear enough dot alignment at quite long work distance, you will first think of the use of advanced laser tech applied dot aligning from Berlinlasers green laser diode module. On condition that this green laser module gets easy connect with 3V or 4.2V DC input power supply, it can achieve highly bright and visible green laser dot immediately.
This green laser diode module is only available with 16mm or 26mm diameter laser tube, it is very convenient to carry and operate. In addition, it is merely used as a separate part, but mostly used as an accessory part of other industrial machine or device. Users can try to install this green laser module on a laser marking machine, laser engraving machine, drilling device or button positioning system, getting super clear and high efficiency dot alignment perfectly.
http://www.berlinlasers.com/532nm-green-laser-diode-module