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Ph meter other than Extech

Started by george13, May 15, 2011, 03:59:18 PM

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george13

I was wondering if anyone out there utilizes a different meter, perhaps somewhat more reliable and possibly more accurate.  I would not be opposed to the additional cost of such an instrument.  I was thinking in line with Cole Parmer or similar scientific dealers for such an instrument.  I have looked at their products, and now I was hoping for some personal experiances or recomedations.  Any advice would be greatly appreciated.
Thanks,
George

linuxboy

I've used just about every major brand out there, and a good number of models from each. Often, it's the probe that makes a difference and not the meter. What exactly do you want to know? If you want model/probe recommendations, there are a good 50 or so that work well.

george13

I am looking primarily for accuracy, consistency, and low maintenance (infrequent re-calibration, battery replacement, etc.).  Since I may have someone other than myself use it on ocassion, I want it to be "user friendly" and somewhat straight forward so that if steps 1,2,3 are followed, they can take an accurate reading.  Also, it must work well in solid cheese, (semi-solid)curds, and liquids (whey).  Lastly, I would rather spend up front rather than "down the road costs" especially if the original unit may be somewhat inexpensive, but the components/replacement parts costly.  That is why I am seeking the views of individuals here, since I know most have had similar experiances, and I value their opinions.
Thanks

linuxboy

Look for a probe with these characteristics. I have found the meter base units to be largely similar in performance. I do prefer waterproof handheld units for portability, unless you have a dedicated lab setup and prefer a benchtop base.

- Either ISFET or double junction
- Flat tip or spear tip
- KCl/AgCl2 reference system
- If possible, refillable reference solution
- Latest gen teflon or ceramic reference junction that is resistant to fouling
- Sensitivity to .01
- ATC capability through sensor on meter

If you start with that, you should be in good shape. Probes can be relatively inexpensive, $100-$150 or so in some cases. Combine with a reasonably priced used base unit, and you can have a great setup for a few hundred dollars.

george13

Thank you for the detailed and very informative reply, do any meter brands come to mind, if not, I'll commence my internet research.
Thanks again.
George

linuxboy

Really, all the major ones work well in my experience, when used properly and maintained properly. Oakton, Hanna, Fischer, VWR, Hach, Cole palmer, Corning, even Milwaukee, etc

You have to first settle on a form factor based on your usage. All in one or with a probe? Handheld or benchtop? Stick type or portable?

A lot of times you can buy a used unit and recondition the probe, or buy a new probe. I've posted instructions before here on reconditioning.