section in a horizontal plane that has eight uniform side surfaces 10 the base portion 5 has a maximum width that is indicated by dimensional arrow identified by the letter a the top portion 6 is also of uniform height throughout and has an octagonal cross section that has eight uniform side surfaces 12 the top portion has a maximum width that is indicated by the dimensional arrow identified by the letter b the dimension b is less then the dimension a in the illustrated embodiment the tool 1 is designed to allow a user to measure in one sixteenth inch increments as is seen the top portion 6 is skewed that is not centered relative to the base portion 5 a first side wall 15 of the top portion is spaced one sixteenth of an inch from a first side wall 16 of the base portion 5 a second side wall 17 of the top portion is spaced three sixteenth of an inch from a second side wall 18 of the base portion progressing around the tool 1 the walls are sequently spaced seven sixteenths eleven sixteenths fifteen sixteenths thirteen sixteenths nine sixteenths and five sixteenths of an inch apart all of which are set in position by placement of two adjoining walls 15 and 17 as the top portion width b is one inch less then the base portion width a the bottom portion 7 see fig3 is similarly skewed but slightly different in that the bottom portion 7 has a maximum width indicted by the reference arrow that is identified by the arrow c that is one and one eighth inch less than base width a one side 20 of the bottom portion 7 is.