iGaging Digital Electronic Height Gauge is inexpensive but performs very well. I originally purchased it to set up a router for cutting locked miter joints and it was perfect for the job. I have found many other applications such as setting my jointer blades after replacement, for setting the height of my dado blades and for setting up router cutters for frame and raised panel doors. This tool has reduced the time for all of these tasks significantly. The display is easy to read and I am particularly happy with the choice of units - mm/decimal inches/fractional inches. Every bit as good as more expensive gauges; it only lacks a micrometer adjustment feature.