When I was still at the factory we would check something like that by placing it on a granite block that had been honed to perfect flatness and then use a dial indicator that was setting on that same granite block, but we were checking for far greater precision than what you are asking about.
An 8 foot by 8 foot piece would be nearly impossible to check with the method I described, and if tolerances within 1/100" is what you need, maybe you could find an 8' straight edge, lay it down on the surface, and then use a feeler guage to check for variances.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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