Originally Posted by land locked
...There are digital ph monitors for as little as 9.99 but not sure about accuracy at that price. They are not the Pinpoint ones I see advertised in the fish magazines.
Seeing that pH meters from reputable manufacturers (Hanna, Milwaukee, Pinpoint, etc) start at $30 or so and go up from there, I'd really question the accuracy of a $10 no name unit.
Test kits are pretty cheap, accurate and don't need batteries or calibration.
[Edit: If you go electronic, just keep in mind that it can fail too - and probably in more ways than good ol' manual test kits. Putting too much trust in your electronics can lead to big problems. Just saw a post recently on another board from a person who was trying to figure out why their pH was dropping day after day. They were dosing trying to get it back up. But it was still going down. The short story is a cat chewed into the cable going from the pH probe to the monitor. Moral of story is always question "strange" readings and have the ability to test the old-fashioned way!]