I needed a readout for my Bridgeport mill in my home business shop. The features and performance are great for the price. Resolution can be changed from 5 to 3 places and there is a bolt circle function, trig functions, calculator functions as well as angle finding. Error calibration is easily programmed via the instructions. I used a 6" standard and dial indicator to get the readout correct.Installation is typical for these units and care must be taken to get mounting holes level. There is a lot of adjustment available with the supplied mounts.