Abstract: An adjustable instrument, capable of several functions, is provided for use by a pipe fitter. The primary use of the instrument is for positioning pipe sections and pipe fittings for joining, and it may also be employed to locate certain points on the exterior surface of a pipe length or fitting in preparation for a joining operation. The instrument is intended particularly for onsite use in accurately positioning tubular pipes and connections which are joined by application of annular weld beads. The instrument comprises a rigid squaring tool having a slidable carriage means movable on its major bar portion, and a rigid adjustable leg projecting from the carriage means in parallel relation to the fix leg of the squaring tool. The carriage means is provided with a releasable locking means to permit selective readjustment of its position along the major bar portion on which it is mounted.