Do not buy this level.  It is not accurate.  When the bubble is centered in the horizontal position it is actually not level.  I returned the first one I received and got a replacement.  The second was just as bad as the first.  To make matters even worse, the bubble is small and the lines are far apart so the bubble doesn't touch the lines.  That makes it very hard to tell if the bubble is in the center.  I placed it on top of a large contractor's level just to be sure, and the bubble was way off center on this one when the contractor's level bubble was centered.