I have been using pieces of granite countertops for things like marking and testing with vee blocks. There is a lot of commenting on the web about how unsuitable these things are and how the beginner should just get a cheap granite surface plate at Enco when they have their free shipping days. Recently, there was an estate sale in my neighborhood and someone bought a beat up old table saw and left the table. The seller convinced me to pay $5 and besides, I was curious about how flat it...
Observations On Table Saw Flatness
Observations On Table Saw Flatness