[TowerTalk] Re Plumbing a Tower

[jimlux]

Robrk wrote:
> How about one of the laser level light beam things? I have the cheap, $39, Craftsman, that shoots a red line, vertical or horizontal with bubbles. It has a camera tripod hole in the bottom.
> More dollars gets auto leveling, digital readout and a mount for the owl.
> 
> Sent from my iPad
> 

The challenge is the beam divergence on these inexpensive levels.  If 
it's basically a laser pointer in a housing, then a divergence of a few 
milliradians is typical.  That means the beam spreads about 0.5%.. at 
the top of a 100 ft tower, the spot is 6" in diameter.  (and it's hard 
to see in the daytime).

They work great indoors across a room at 15 feet (the spot is still nice 
and small).