I came across this online, and it looks a heck of a lot like a surface plate. The specs are 4-foot x 3-foot x 4 inches. The seller doesn't know if its a surface plate or not. just from visual inspection of the picture and the stand it's in makes it look like one. If anyone can point out something or if I go and look at it in person what I can do to get a rough idea of precision. If I look at it I plan on bringing some Parrales and a feeler gauge or something and use that. Thanks for looking.