I use to do machine set up and training. Email me the forms (scan them whatever you have to do. Usually they use a precision square or a cylinder square to check the z axis perp to the table. This will also find chuck holes in the vertical rails. Better test is to use a ballbar in several locations on the table. They will tell you a whole lot in a little time with out ripping covers off. I do this on the weekends. I have installed over 40 machines. I have used ballbars and lasers to calibrate machines.