At what grade do you think its no longer possable for the naked eye to grade?

There is the issue that we need glasses as we get older ... not a small issue when 1000's of dollars are riding on a difference between an MS 66 and an MS 67.

Ruben

 

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Ever try to figure out what 10% OFF means? That is a huge business lexicon. There are always specifications given to normal words in business because the precision is needed. In the real world, there is no such thing as perfect, not even your wife

It needs specific defining. That being said, I agree they are too lose with the term anyway, even by their own standards. But defining terminology is the first part of any area of study, business or not. What is "effective" in medicine? What is 325mg in Pharmacy. What is the length of a coastline in geography (the closer to measure the larger the coastline - see discussion under fractional mathematics), what is a Clear Glass, a "Perfectly Clear Glass", a strong sun, a pure soap? What is a pound? An Ounce?!!! (big question), the weight of a dime, "strong Liquor", fire proof fabric.

Ruben