Wookii
Member
Maybe I am being unfair here but I just wanted some help with my original questions, not to know the theoretical most maximally effective way to measure ph, its way out of my budget. Maybe I should have started with a disclaimer about that, if so I apologise, I will do better. Just getting a bit frustrated if im being honest
Sorry, should have read that last line before posting above - the Hanna pens you have linked to in the OP will do precisely what you want them to, they will allow you to perform a pH profile.
You can also get significantly cheaper ones on Amazon:
Whilst I can't personally vouch for any one of them, most should be sufficiently accurate for you to be able to take measurements for a simple approximate 1pH drop. They just may not be particularly long life products, and won't be of the same order of quality as the Hanna units - like many things in life, with devices like these you often get what you pay for.