James Bond couldn't shoot holes in his
archenemies with this laser, but he
could project a level reference line up
to 100 feet away. The Finish Line laser
runs on three AA batteries and can be
attached to a standard photographic
tripod with a 1/4-20 thread. The manufacturer
claims that the beam is accurate
to within 1/4 inch in 100 feet, but
even with 5-arc-minute vials (about
seven times the sensitivity of a standard
4-foot carpenter's level), I think that's
a little optimistic. My experience with
similar levels is that a dot out at 100
feet can move about 1/2 inch vertically
without any movement registering on
the bubble. But either way, this system
is certainly accurate