J wrote:
From what I read, laminate flooring manufacturers want a floor within
3/16-inch across 20'. What tool can I use across a floor to
determine how level it is? A 4' level doesn't do much good.

"HeyBub" wrote in message
...

Marble?

A whole bag of marbles is better, strewn everywhere on
the floor. If they tend to roll together, this probably
indicates a low spot.

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)