You no longer need to align a rule or mess with set up blocks when youre trying to accurately set router bit or table saw blade height. The 1-1/2" x 4" base features a magnetic strip to help hold the gauge in position while the large digital readout lets you set your cutter height to exactly the depth you need. Fast, accurate and repeatable cutter height setting allows you to make precise cuts and repeat your set ups. The shape of the anvil lets you use the gauge to set router fence position up to 4-1/2". Displays both fractions and the decimal equivalent at the same time so you know your fraction is exactly on, not rounded up or down like other fraction read outs. Accurate to +/- .001", 1/500", or .025mm