Normally, ‘professional’ quality means better quality. Artists’ paints, for instance, come in ‘student’ and ‘professional’ grades, and the professional ones are made with real pigment instead of synthesised stuff and are correspondingly more expensive for the ones made of precious things. A professional bricklayer will do the job better than some bloke who does it in his spare time (in theory, anyway). A professional musician plays music for a living and can be assumed to be pretty good at it.
Olympic athletes are not professionals, though: they’re amateurs. It’s in the rules. If you ‘turn pro’ in boxing you can’t compete in the Olympics any more. Here, ‘professional’ means ‘does it for money’.
And the toilet paper they use in my workplace is ‘professional quality’, which in this context means ‘not the good stuff that you buy for yourself’.
|I was going to photograph the actual packaging but it's been thrown away, so here's The Professionals instead.|