The Wixey WR25 Mini Digital Height Gauge is a Light Weight, Easy to Use Gauge for all Types of Wood Working Applications. Use this Gauge for Setting Saw Blade and Router Bit Heights as Well as Positioning Fences on Router Tables and Band Saws. The Large Easy to Read Display Reads in Inches with Fractions or Millimeters. The Fractions are Displayed Using Precise Fraction Technology which Gives you 4 Times The Accuracy of Other Fraction Readouts. The Decimal Inches are Displayed in .002-Inch Increments and The Millimeters in .1mm Increments. The Accuracy and Repeatability Are .004-Inch (.1mm)