This is a very accurate observation which is an irritating one for me, because the polisher mixed up the numbers against my instructions, it is not right.
I have posted earlier, that they mixed up the numbers up to 660.
My apologies for that, it won't happen again.
Like I said... It was just an observation. Personally, I don't care what my numbers are. I just glad to have the devices. Looking forward to being able to buy the longer tubes.