Here is one SmartLevel.

www.midwestunlimited.com/store_detail.lasso?-Token.id=10015

There is an underlined dash between store and detail   as in
"...store_detail..."

part number MDB02346  6 inch SmartLevel

It is digital 6 inches long and measures to the tenth of a degree.  I used
in on my Lancair with much frequency.  Works great by itself or on a
straightedge.  It is also used estensively on my model airplanes and is a
great tool.  Cost is $105.95.

Enjoy.

Bob Smiley
N94RJ