Trumbull Pipe O.D. Outside Diameter Measuring TapeTrumbull Pipe Diameter Measuring Tape Blade is 1 4 width x 10 length, available in both inch and Metric models. Most competitive models of diameter tapes can only measure up to 20 or 24 pipe. Trumbulls tape will measure diameters up to and including 36 ductile iron pipe! Diameter Tapes are for identification of pipe, not for precision measurements. For precision measuring tapes, contact Trumbull. A necessity for any water utility or waterline