Demo grade devices have passed all key functional tests. They can be described as flawless or like new. They do not have any signs of use.

A grade devices have passed all key functional tests. They appear flawless at first glance.

They have a few, very minor blemishes that are only uncovered upon close inspection and/or rotating them under the light. Theses blemishes are often found near the ports, corners or the Apple logo.

A- grade devices have passed all key functional tests. They may appear flawless at first glance.

They may either have several faint, small scratches or a few longer, faint scratches on the screen. They may have light scuffs on their housing.

They may have small dings, blemishes and /or nicks which are often found near ports, corners and edges.

A small percentage may have one slightly more pronounced imperfection, if they are in otherwise excellent

B grade devices have passed all key functional tests. They appear used at first glance.

They may have numerous scratches on their screens. They may have numerous scuffs or scratches on their housing.

They may have dings, small dents and heavy wear on their ports, corners and edges.

C grade devices have passed all key functional tests. They appear heavily used at first glance.

They may have more pronounced, deeper scratches on their screen or housing they can be felt easily with a fingernail. Their housing may have numerous scuffs, scratches, dents or other abnormalities.

They may have dings, dents and heavy wear on their ports, corners and edges.