[lug] OT: android elevation app accuracy

[Jed S. Baer]

On Sun, 29 Sep 2013 16:28:03 -0600
Jed S. Baer wrote:

> > i.e. how much slope there is, if any,
> > between these two corners
> 
> I think your best bet will be to use a string level. Or, a 4 foot or
> longer beam level, working along your gutter.

Or,
http://www.homedepot.com/p/Johnson-Hand-Held-Sight-Level-80-5556/202911589
http://www.homedepot.com/p/Johnson-Torpedo-Laser-Level-40-0915/202258085

Might be you know someone who has a laser level already?