Measure all angles in a 360º range with smart tool .
The display evenflops over with the level, shutting off automatically
after five minutes when not in use, all from a standard 9-volt battery.
It also features angle accuracy to 1/10 th of a degree, a mode button 
that lets you see angles in the three-way degrees, percentage slope or
pitch (inches of rise per foot of fun), and listen and level, ideal for poorly lit areas.