laser levels, part 2

[Mark Andy <mark@sccaprepared.com>]

Howdy,

Ok, so I tried the $45 laser level from Home Depot.  It's supposed to 
project a horizontal and vertical line.

Which it did, for about 5', then the line petered out.  Perhaps its for 
use only during the night?  :-)

What I really want to do is to have something I setup in the middle of a 
room/area (say 50'x50' just for the heck of it), hit a button, and I get a 
(visible) plumb line displayed all around the device.

What do I need to do that?

Thanks!

Mark