Look okay. The small diaphragm suggests it won't be as accurate as a Clesse, but I have no idea if I
need the accuracy a Clesse provides. Originally, I was looking for something to fill the gap with "common" regulators that are only reliable down to 7.5 or 10PSI (maybe 5 for particularly good ones). Never found 0-10PSI or I'd be still using them now.
Watch out for claims to be 0-... . They can't be used down to zero! But you do see it a lot. Watch out for folk who believe their ordinary regulator will hold to 5PSI. But with one of those 0-10s you shouldn't be in that fantasy group any longer (and welcome to the group I'm in, where, like me, you can be a right pain-in-the-a...).
I've never come across "FNTP", does the "F" stand for "Fine" NTP thread?
You may have had difficulty finding the Clesse regs (except in UK) 'cos they seem to be mostly used for heaters in sheds raising game birds. There's still plenty of rich clowns in the UK who think it's great sport to blast harmless birds, bred specially. out of the sky (and then bulldoze their bodies into a hole). You may have come across "Brooder" looking at those Clesse jobs ... that's what if means.