A trip hazard measurement gauge is, except for a measurement module and display, constructed primarily of aluminum. A cylindrical tube has an upper straight section and a lower straight section that are interconnected by a curved section. The upper straight section and the lower straight section form an obtuse angle. A cylindrical aluminum housing is connected to the tube via a conical connecter piece. A non-movable foot is rigidly connected to the cylindrical housing. A measurement module is installed within the cylindrical housing. A slidable rule, to which a movable foot is attached to a lower end thereof, extends from the measurement module. A return spring ensures that the movable foot returns to its lowermost position. After turning ON the display, selecting the measurement system and zeroing the gauge, it is ready to measure differences in elevation between adjacent sidewalk slabs.

The present invention provides an adjustable square ruler or measuring device, comprising four right angled pieces, four first straight pieces, four second straight pieces, four third straight pieces, four fourth straight pieces and four fifth straight pieces. All of the right angled pieces, the first, the second, the third, the fourth and the fifth straight pieces being between 0.05 and 0.15 inch in thickness, made of a transparent material and having five interlocking fingers on one open end and corresponding five interlocking finger openings on another open end. Further, when four right angled pieces are coupled together either separately or together with four of any of the first, the second, the third, the fourth and the fifth straight pieces create a transportable, perfectly flat square or rectangular ruler which can be used for marking, trimming or cutting.

The present invention provides an adjustable square ruler or measuring device, comprising four right angled pieces, four first straight pieces, four second straight pieces, four third straight pieces, four fourth straight pieces and four fifth straight pieces. All of the right angled pieces, the first, the second, the third, the fourth and the fifth straight pieces being between 0.05 and 0.15 inch in thickness, made of a transparent material and having five interlocking fingers on one open end and corresponding five interlocking finger openings on another open end. Further, when four right angled pieces are coupled together either separately or together with four of any of the first, the second, the third, the fourth and the fifth straight pieces create a transportable, perfectly flat square or rectangular ruler which can be used for marking, trimming or cutting.

A tool for controlling an offset between two stops, includes: a body which includes an extension with an end configured to abut against one of the stops, a sliding rule that is configured to slide in a longitudinal direction in relation to the body and which has an end configured to bear against the other stop, the sliding rule being shifted in a transversal direction in relation to the extension, and a system configured to control the displacement of the sliding rule in relation to the body.

One or more specific embodiments disclosed herein includes an apparatus for manually measuring the distance between a first and second point, comprising: a first and second member that is positioned adjacent to the first member, wherein the first member is capable of sliding with respect to the second member in an axial direction and wherein each of the first and second members is substantially straight and has at least two outer longitudinal sides that are substantially straight and substantially parallel to one another, a first replacement tip receiver at a first location between the two outer longitudinal sides of the first member, wherein a first tip can be removably coupled to the first member, and wherein the first tip includes a first tip point capable of corresponding to the first point of the distance to be measured, and a first scale that provides a first distance measurement.

One or more specific embodiments disclosed herein includes an apparatus for manually measuring the distance between a first and second point, comprising: a first and second member that is positioned adjacent to the first member, wherein the first member is capable of sliding with respect to the second member in an axial direction and wherein each of the first and second members is substantially straight and has at least two outer longitudinal sides that are substantially straight and substantially parallel to one another, a first replacement tip receiver at a first location between the two outer longitudinal sides of the first member, wherein a first tip can be removably coupled to the first member, and wherein the first tip includes a first tip point capable of corresponding to the first point of the distance to be measured, and a first scale that provides a first distance measurement.

The present invention provides an adjustable measuring device comprising a starting piece, an end cap piece and at least three straight pieces. Further, when the starting piece is coupled and capped with the end cap piece or coupled with one or more of the straight piece of the three straight pieces and capped with the end cap piece, a transportable, perfectly flat square or rectangular ruler measuring at least 3 inches in width and one of 6 inches, 12 inches, 18 inches, 24 inches and continuing in 6 inch increments, in length, is created, which can be used for marking, trimming or cutting.

The present invention provides an adjustable measuring device comprising a starting piece, an end cap piece and at least three straight pieces. Further, when the starting piece is coupled and capped with the end cap piece or coupled with one or more of the straight piece of the three straight pieces and capped with the end cap piece, a transportable, perfectly flat square or rectangular ruler measuring at least 3 inches in width and one of 6 inches, 12 inches, 18 inches, 24 inches and continuing in 6 inch increments, in length, is created, which can be used for marking, trimming or cutting.

There is provided a linear displacement measuring apparatus which notifies a user when being installed defectively. A slider includes a traveling body which travels along a main scale on the main scale, a carriage part mounted on an object, and coupling means which couples the traveling body with the carriage part. The coupling means allows relative displacement between the traveling body and the carriage part and biases the traveling body towards the main scale. The coupling means has a connecting rod arranged so as to couple the traveling body with the carriage part via a ball joint. The slider further has misalignment detecting means which detects that the relative displacement between the traveling body and the carriage part exceeds a prescribed allowable range. The misalignment detecting means is a pair of projecting pieces arranged in a vicinity of the connecting rod so that the displacement of the connecting rod is regulated within a predetermined range.

There is provided a linear displacement measuring apparatus which notifies a user when being installed defectively. A slider includes a traveling body which travels along a main scale on the main scale, a carriage part mounted on an object, and coupling means which couples the traveling body with the carriage part. The coupling means allows relative displacement between the traveling body and the carriage part and biases the traveling body towards the main scale. The coupling means has a connecting rod arranged so as to couple the traveling body with the carriage part via a ball joint. The slider further has misalignment detecting means which detects that the relative displacement between the traveling body and the carriage part exceeds a prescribed allowable range. The misalignment detecting means is a pair of projecting pieces arranged in a vicinity of the connecting rod so that the displacement of the connecting rod is regulated within a predetermined range.