A tape measure to be reeled on a spool rotatably mounted within a housing defining an opening for paying out and for retrieval by rotation of the spool within in the housing. The tape measure includes a tape having a first end and a second end. The first end connected to the spool and the second end movable through the opening between a retracted position and an extended position. The tape includes a steel blade with length markings on the obverse. The blade extends along its length from the first end to the second end having a window. The window includes a pane of polymer. The polymer includes pigments to selectively transmit laser emitted from a laser level. The pane in held within the window in a manner allowing the reel to pay out and retract the blade in use.

A tape measure to be reeled on a spool rotatably mounted within a housing defining an opening for paying out and for retrieval by rotation of the spool within in the housing. The tape measure includes a tape having a first end and a second end. The first end connected to the spool and the second end movable through the opening between a retracted position and an extended position. The tape includes a steel blade with length markings on the obverse. The blade extends along its length from the first end to the second end having a window. The window includes a pane of polymer. The polymer includes pigments to selectively transmit laser emitted from a laser level. The pane in held within the window in a manner allowing the reel to pay out and retract the blade in use.

An edge finder to locate a work piece, work-holding feature or cutting tool with respect to the spindle of a machine tool includes a shank, a body and an indicator. When the shank is attached to the machine tool spindle, the longitudinal axis is coextensive with the spindle axis of rotation. The indicator measures the location of a work piece, work-holding feature or cutting tool with respect to the shank longitudinal axis. The indicator is rotatable so that a machinist may read the indicator from any direction.

An edge finder to locate a work piece, work-holding feature or cutting tool with respect to the spindle of a machine tool includes a shank, a body and an indicator. When the shank is attached to the machine tool spindle, the longitudinal axis is coextensive with the spindle axis of rotation. The indicator measures the location of a work piece, work-holding feature or cutting tool with respect to the shank longitudinal axis. The indicator is rotatable so that a machinist may read the indicator from any direction.

A perpendicularity verification device is provided for verifying perpendicularity of a concrete test specimen in a testing machine. The device comprises a unitary planar sheet. The sheet has an elongate vertical straight side edge and a horizontal straight bottom edge. The side and bottom edges are perpendicular to one another. A corner notch is provided between the side and bottom edges. In use, the bottom edge rests on a platen of the testing machine so that the notch circumvents a retaining cup of the testing machine and the vertical edge rests against the test specimen.

A perpendicularity verification device is provided for verifying perpendicularity of a concrete test specimen in a testing machine. The device comprises a unitary planar sheet. The sheet has an elongate vertical straight side edge and a horizontal straight bottom edge. The side and bottom edges are perpendicular to one another. A corner notch is provided between the side and bottom edges. In use, the bottom edge rests on a platen of the testing machine so that the notch circumvents a retaining cup of the testing machine and the vertical edge rests against the test specimen.

A method of verifying that a robot carried self-piercing rivet gun system is set-up so that workpieces that are to be riveted will be normal to a self-piercing rivet gun of the robot carried self-piercing rivet gun system during riveting includes utilizing a perpendicularity sensor to verify that the workpieces will be normal to the self-piercing gun during riveting.

A method of verifying that a robot carried self-piercing rivet gun system is set-up so that workpieces that are to be riveted will be normal to a self-piercing rivet gun of the robot carried self-piercing rivet gun system during riveting includes utilizing a perpendicularity sensor to verify that the workpieces will be normal to the self-piercing gun during riveting.

A method and apparatus for aligning a crosshead of a mud pump with the fluid end of the mud pump without having to remove the rod system (piston rod, extension rod) of the pump. The apparatus comprises a dial indicator which measures differential distance and a connection component for connecting the apparatus directly or indirectly to the crosshead. The method and apparatus allow the establishment of perpendicularity and concentricity of the crosshead with respect to the bore in the fluid end of the pump.

A method and apparatus for aligning a crosshead of a mud pump with the fluid end of the mud pump without having to remove the rod system (piston rod, extension rod) of the pump. The apparatus comprises a dial indicator which measures differential distance and a connection component for connecting the apparatus directly or indirectly to the crosshead. The method and apparatus allow the establishment of perpendicularity and concentricity of the crosshead with respect to the bore in the fluid end of the pump.