Abstract: A combination plumb/level device for removable attachment to a try square of magnetizable material to enable the square to be used as a level or a plumb. The device comprises a spirit level, and a holder for the level. The holder has a magnet associated therewith for magnetically gripping one face of a standard, unaltered leg of the try square with the level oriented relative to the face. The magnet associated with the holder is engageable with an edge of the standard, unaltered leg and orients the level with respect to the edge, enabling flatwise application of the other face and edges of the try square to a surface whereby the try square may be used to ascertain level or plumb positions. Other embodiments, including those directed to a device adapted for removable attachment to a try square of non-magnetizable material, are also disclosed.

Abstract: Stroller apparatus for converting a child's car seat having a supporting base into a mobile stroller unit in which the stroller apparatus includes a base frame, front and rear wheel sets mounted on the base frame for movement between an extended stroller position and a retracted car seat position within the base frame, an actuating lever for selectively operating the wheel sets between the extended and retracted positions, a latching mechanism for releasably interlocking the car seat supporting base to the stroller apparatus, and an extensible handle movable between an extended stroller position and a car seat position.