Patent ID: 7530175

Claim:
A twin level assembly comprising: a first level having a frame with a pair of generally parallel and longitudinally extending edges and at least one laterally extending end cap positioned proximate an end of the longitudinally extending edges, wherein the end cap has an opening therein, wherein the opening is in communication with a receptacle, wherein the receptacle extends a length dimension along the longitudinally extending edges and a height dimension between the longitudinally extending edges, and wherein the first level has at least one bubble vial in the frame; and a second level having a pair of generally parallel and longitudinally extending edges, at least one bubble vial and an indicating device, wherein the at least one bubble vial of the second level is intermediate the edges of the second level, and wherein the edges of the second level are spaced apart a distance less than the height dimension of the receptacle; wherein the entire second level is selectively fully receivable in the receptacle through the opening in the end cap of the first level, whereby when the first and second levels are not being used independent of each other, the receptacle provides a storage location for the second level.