Patent ID: 8484856

Claim:
A device for determining the slope of a surface in relation to a predetermined slope in order to enable the surface to be positioned to equal the predetermined slope, and comprising: a. an elongate frame having an index side for being positioned on a surface, the index side further comprising an indentation and a strap, the indentation having a depth equal to or greater than the thickness of the strap and the strap being removably attached to the frame at a point located within the indention via a snap connection; b. a plurality of slope indicators comprising tubes having a liquid and a movable gas bubble therein, fixed on the frame and positioned in relation to the index side at a predetermined angle between 0.5 degrees and 5.0 degrees, wherein each of the tubes has a pair of reference lines on the surface of the tubes, the distance between the reference lines is approximately equal to a width of the gas bubble, and each of the reference lines are displaced the same distance from a notional center line that is located at a midpoint of the length of the tube, for visually indicating that the slope of the surface is equal to the redetermined slope when the bubble is within the reference lines; and c. whereby, when the slope of the surface is equal to the predetermined angle of a desired one of the slope indicators, the slope indicator functions to indicate that the desired slope of the surface has been achieved.