Looks like I'll be getting it then
The Tunze regulators, from what I've read from their website, are designed to be used with a pH controller, because they do not have a built-in solenoid. And I was thinking of getting a pH controller anyway. The Tunze ones are $300 I think, so it looks like I'll have to fork out a lot of money to get one. Although I don't mind paying extra for good-quality products