I had not checked pH since my first cycle. When I got my Apex, I didnt even pay attention to it other then to say it was there. I watch it more now that I am dosing as pH is directly affected by ALK. Unless you are dosing, I do not see a reason to test it. Much like I have not checked ammonia in that long either. If you are testing it, API tester is more then acceptable for readings on pH and ammonia IMHO.