Abstract: A precision machinist's square comprises a blade and body joined together at a pivot and a drive train operated by relative angular movement between the blade and the body. Movement of the drive train develops a movement in a dial indicator that is a function of the angle between the body and the blade.

Abstract: An improved vise with a fixed jaw and a movable jaw which is guided by a lead screw to move along a pair of ways guiding the movable jaw. The movable jaw is adjusted to maintain a face which is precisely parallel with a face of the fixed jaw. The movable jaw is constructed of an upper component which travels on the ways, and a U-shaped lower member which inserts and telescopes into the upper component. The two jaw members contact at a chamfered face which cants or tilts the upper jaw member so that the movable jaw construction can be leveled. Leveling assures that the upper and lower jaw members cooperate, thereby interacting with a tapered face between the two to change the relative angle. In effect, the movable jaw face is maintaining precisely parallel and overcomes off center mounting of a workpiece.