Angle Finder, Mag, 0-90 Deg, 2-1/4 Base/ GENERAL CHARACTERISTICS ITEM DESCRIPTION: MAGNETIC BASE; HIGH IMPACT PLASTIC HOUSING; 2-3/4 IN. DIA DIAL; FOR READING ANGLES 0 TO 90 DEG; ACCURATE TO 1/2 OF 1 DEG; ANGLE AND GRADE CHART ON BACK SHOWS ANGLES IN DEGREES AND CONVERTS THEM TO PITCH PER INCH AND PITCH PER FOOT; 2-1/4 IN. BASE LENGTH