In any type of low price and high stability dot alignment, no matter it is pointing at close or long distance, Berlinlasers 50mW to 100mW blue laser diode module always brings users quite satisfied dot measurement as expected. It projects highly visible blue laser beam at several miles. Only if it makes proper use of dot alignment within 25 meters, it assures quite satisfied dot measurement as expected. 
After easy use of 5V, 9V 1000mA AC/DC adapter, not spending extra time on battery change or prior dot positioning work, this blue dot laser alignment assures long lasting dot generation, and no decay light under overheating and over current impact as well. When it selects correct output power and makes proper adjustment of laser beam focus, after immediate laser light concentration, it converts into highly precise blue dot projection for laser show, laser displaying, decoration, military targeting and lab experiment work tec.
https://www.berlinlasers.com/445nm-blue-laser-diode-module
https://www.berlinlasers.com/high-power-445nm-150mw-500mw-blue-laser-diode-module