I am very new to lasers. I need to be able to fire a laser over a distance of one mile and keep the dot small enough and bright enough to be seen at the other end. I have purchased three lasers two of which didn't have the enough power(1mW) and one 2W(LuckLaser cost £80) which didn't keep a small dot over the distance. The dot became so large after over 100m that it couldn't be seen. Before I buy another laser disaster is there anyone that can help please?