Re: pH Meters

[Ken Simolo <Simolo@chem.chem.rochester.edu>]

Tim,  If you are going to spend that kind of money ($125 - $150), I 
would recommend the silicon chip sensor pH meters. They can be stored 
dry and the electrodes are good for 10,000 - 20,000 readings.  Most 
of the standard gel pH electrodes (the kind found in most of the 
smallhand held pH meters) last for 6 months to 1 year and then you 
have to replace the whole meter.  The best price/performance that I 
have seen are at www.phmeters.com - I just ordered one that I will be 
testing for use in our chemistry labs.  They came highly recommended 
by a salesman who only carries standard hand held pH meters so he was 
actually losing business by recommending them!  The extra $25 to get 
the model 125 (if I remember correctly) is worth it because you get 3 
point calibration capability among other things.

I have had good luck with the "inexpensive" ($60) hand held 
conductivity meters as well as a new $25 tds meter I got for $25 on 
ebay.

Ken



>I have been looking for a really good ph/ec/tds meter. Hanna Instruments
>has two for 150.00 each. Has anyone had any luck with these multi
>meters, or any suggestions on brand names to look for, or are they a
>waste of time. I have heard the Pinpoint PH meter is pretty good. What
>do yall think?
>
>Tim
>
>
>
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