Upgrade your old tape measure with the Universal Tape Gauge (U.T.G.) by Dowelmax that fixes the age-old problem all tape measures have: inside measurements. Bend the tape around a corner and guess what the measurement is no more. The U.T.G. makes your tape more accurate with precise measurements for crown molding, baseboards, shelf units, area calculations, window frames, etc. Compatible with 99% of all existing tape measures, the U.T.G. can easily be calibrated to within thousandths of an inch.