What is the meaning of a grade A, B, or C when selling second-hand items?

What is the meaning of a grade A, B, or C when selling second-hand items?

The second-hand items are used repaired or refurbished by the seller – independent of each trader the category of grade A, B,  C, D or F can be changed, but normally, here is the UKgoodbye Category list:

1. Grade A – Mint or Oh la la condition. Usually is the best quality – as appear as new but used
2. Grade B Less than Grade A, but fairly used with some scratches
3. Grade C Poor external quality signs of being used a lot
4. Grade D – it is not working at all, maybe the item could be used to repair another one.

The item should be working perfectly independently of its grade A, B, or C. You are buying a second item, and you are indirectly helping, to extend the lifespan of that item, to reduce global warming.