pH meter

Jun 30, 2007 4 Replies
J

Some time ago there was discussion of pH meters, with a recommendation for one sold by a Quebec firm.



I've lost the reference - can anybody help me?



As for that, probably I should ask a broader question (now that the Canadian dollar has gained strength, and US products don't cost us 1.5 times the posted figure!) - what should I consider for a reliable pH meter for testing my acidity?



I'm partially colour blind in red-greens, and have a real problem seeing the end-point in reds with the TA test kits.



Thanks.



Jack.



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P

Hi Jack-

I don't know the Quebec firm, but I use a cheap one off of eBay. I picked up a pair of solutions for calibration from piwine.com (eventually) after I used up the free cal solution.

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(Note I don't think I bought it from this vendor, it's just the first one I saw that matched what I'd gotten).

The electrodes are replaceable and are supposed to only last 9 months, but mine are still working (as confirmed with calibration solutions) so I haven't replaced them. Readings are a bit sluggish at times, but I've got patience to let it stabilize. Keep the bulb filled with ph 7 calibration solution and the electrode will last awhile.

as for doing titrations with it, I haven't done so- I've the equipment just never gotten around to doing the work. Next time I bet....

Jason

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J

Thanks.

Good info.

jack

snipped-for-privacy@gmail.com wrote:

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B

Same question is asked now and then in many places. Looks like most of the stuff sold below about $50 (USD) doesn't deliver expected results - you may have luck, but in most cases you will not. Look for the one with replaceable electrode and don't belive in cheap ones seems to be the best approach. And remember to take a good care of your electrode - keeping it in the pH 7.00 solution is a good idea.

See my site for theory and practice of pH measurements.

Best, Borek AKA Mr.pH

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