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Thanks maxim - that makes sense. You are not the only one who uses a 1 to 5 scale for hardness and fineness etc. - I am sure I have seen it elsewhere too, but cannot put my finger on where. In any...

What I would also like to know is where this lv1 - lv5 scale comes from? Is it an objective or subjective scale? I have not seen maxim's video, so I apologise if it is described in there. But I am...