The laser finder is good, but VERY inconsiderate tool.
Just imagine, your friend in the same area is imaging while you are playing with this "toy".. possibly destroying their whole evening effort without being aware if it.
Yes, green laser, 1mW is enough to achieve all of this above.. and it could be illegal (in VIC it is treated as a weapon, and requires registration and license)
You should consider red dot finder instead.
http://www.ebay.com.au/sch/i.html?_o...inder&_sacat=0
They work OK (similar to laser - no magnification), and the mark is visible only to user.