What is the difference between Grade A and Grade B refurbished monitors?

Is grade A mean that its from an office and grade b from a private user?

I'd like to know this too! I just bought a refurbished A monitor from a local place, and it's in very nice shape. Only flaw i can find with it is a tiny little scratch on the screen...

correct me if im wrong but A is Tested, no cosmetic or tech damage. 6month exchange
B- working condition, 30day exchange

It will depend on the vendor but generally this rule is followed.

A - perfect working order and in like new physical condition
B - Perfect working order but may include cosmetic defects or damage not related to the function of the product.

C - items never out-right sold to cosumers, but are safe to be donated
Any other grade - only safe to be sold as lots of scrap