I know many seem to complain about the Extech, but they don't rigorously take care of it as you.
I can tell you that I am the proud owner of 3 pH110's. 3, because the first two were junk and the third is yet to be tried. And I am very rigorous in my use and care of the meters. That said, I have nothing but the best to say about the company's customer service. With each call, I was simply sent a replacement meter, without hesitation. Extraordinarily understanding, and that buys my loyalty, personally.
On the other hand - does it seem a bit strange that a company so regularly sends a replacement meter - market cost, over $100 - anytime anyone has an issue? Perhaps it's a fairly common occurrence, as evidenced by just this forum's users, alone?
I do think there's a pretty serious quality control issue. As I understand it, once you find one that works, you've found a great meter. I truly hope so, and am moving forward in good faith.
I agree, it sort of appeared to be flat to me (in the instruction booklet online). Do you think I saw it wrong? I'll definitely double check.
I agree with Sailor on the flat electrode - the 8689 is just a standard pen-type meter with a glass pH bulb. The electrode can look flat, because of a plastic, semi-circular bulb guard, but that's it. If you look at the booklet, page 5, the closeup of the electrode ("2"), you can see the bulb and guard.
