Instruct: Classify the given review as either positive or negative.
Query: not very usefull

I suppose the leveling is OK but I was very disappointed in the stud finder. When I tried to locate the studs in a wall it SEEMED to work. I tried several times and it behaved the same. When I sank the screws in however I hit nothing! Out of 7 studs I thought I located I actually hit something at 4 locations. This device goes back on the shelf as a paperweight!