Abstract: This invention relates generally to a tool for setting grading heights and more particularly to a tool for rapid and efficient measurement of grading heights between adjacent or opposing edges. Briefly stated, the preferred embodiment of the present invention consists of two grading pins spaced apart from each other and inserted into the surface adjacent where grading measurements are desired. Slidably disposed on one of the grading pins is a line casing having a spring loaded retractable string therein with the string having a hook on one end whereby the string is effectively stretched between the two grading pins. Thereafter the string is used as a reference line in order to determine the desired grade height.