Abstract: A leveling system including a first post for contacting an upper surface, a second post for contacting a lower surface, wherein one of the first and second posts telescopes within the other of the first and second posts, a locking assembly disposed on the one of the first and second posts, and a mount assembly for supporting a laser instrument.

Abstract: A battery pack includes a housing comprising a first portion having a first floor and first and second walls connected to the first floor, and a second portion having a second floor and third and fourth walls connected to the second floor, where the first and second floors are non-coplanar, a plurality of cells disposed within the housing, at least two terminals electrically connected to the cells, and first and second latching mechanisms disposed on the housing for latching the battery pack to a cordless device, wherein tacit latching mechanism comprises a latch and a button connected to the latch for moving the latch between unlatching and latching positions.