Abstract: A device may include a captive rigid support plate. A device may include an inflatable bladder including one or more inflatable bladder portions made of airtight material. A device may include a rigid external surface wherein, the rigid external surface includes an area proximal to the captive rigid support plate. A device may include a hose-receiving interface coupled to at least one of the inflatable bladder portions. A device may include an inflation hose coupled to the hose-receiving interface. A device may include an inflating component coupled to the inflation hose. A device may include an integrated bleed valve coupled to one or more of at least one of the inflatable bladder portions, the inflation hose, or the inflating component.

Abstract: The specification discloses a woodworking and home improvement calculator particularly adopted for symplifying common home improvement calculations. The calculator includes a variety of special keys including a gravel, cement, tile, brick, block, 4×8 sheet, paint, wallpaper, stud and roof bundle keys which allow the user to quickly determine the amount of materials needed for projects involving the aforementioned keys.