Grade A
Clean appearance with the same as a new product with no scratch.
Grade B
There are some minor scratches, but the scratches can be erased through isopropyl alcohol or plastic gloss.
Grade C
When you touch the surface with your fingers, you can feel a deep scratch or visible scratch appearance.
Grade D
The following issues cannot be fixed. Fake, Broken surface, Bottom mesh part failure, Deep scratch, Flooding, Product failure (Not a battery problem) such as Microphone breakdown, Blinking green color in the charging case alarm, Low and high speaker volume issues, AirPod Pro noise canceling issues, etc.
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