Location of ph electrode

[lshu]

Regarding the location of the electrode when using a ph controller, is the main tank the most reliable? I've found one other thread of a DIY inline however not a lot of discussion.

[swampy1972]

It just needs to be somewhere in the tank water.. Whether it's inline, in the tank itself or in your sump (if fitted) is irrelevant.
The reason behind the DIY inline thread was simply to hide it from view.