A plumb tool kit attachable to the ends of a common level member, or the like, used to determine vertical alignment. The kit comprises a pair of end caps each having a cap body. Each cap body has a first and a second arm extending therefrom, the first and said second arms forming a right angle. Each cap body has an opening therein to receive a level, each opening having a preselected orientation wherein when the openings of the pair of end caps receive the, the arms are transverse to the level. The first arms and at least a portion of the level define a first plane and the second arms and at least a portion of the level defining a second plane. One or both of the pair of end caps includes an apparatus for determining vertical alignment, such as, for example, a bull's eye level, wherein when the openings of the pair of end caps receive the level, the bull's eye level has a location in a plane transverse to the level. Alternatively, a pair of transversely aligned tubular level vials can be employed, wherein when the openings of the pair of end caps receive the level, the pair of vials have a location in a plane transverse to the level. The plumb tool kit end caps can include, for example, thumb screws which can be tightened onto the level to retain the end cap onto the level.