Re: [Killietalk] pH meter

["Ron Schulz" <ron_schulz at gmail.com>]

Hi Barry,
 A little perspective.......how much did the ISFET meter cost?

....................................Ron Schulz.......Dutchess County
NY UNYKA, MAKA

On 7/20/08, Barry Cooper <barry_cooper at mac.com> wrote:
> Wright Huntley wrote:
>> I use the pH meter very infrequently, so the cheaper Hannah ones do fine
>> for me.
>>
>> My biggest problem was in the bay area, where hard water scale made the
>> sensor eventually get a bit squirrelly.  The solution was a soak in the
>> pH=4 calibration buffer, which always seemed to restore normal ability
>> to calibrate and use them.
>>
>> Barry's problem sounds more like a battery issue, but a wash in acid
>> might be worth a try.
>>
>> Wright
>>
>>
> Well, the point is, as Brian Watters pointed out, most of us use these
> things infrequently. However, every now and again I need to check the pH
> of my tank water, as my well water comes out of the tap at pH 10.
> Prolonged soaking has not restored y Hannah meter. I always put buffer
> on a wad of cotton wool in the bottom of the cap, but I'm sure that it
> still dries out between uses. So, any meter whose sensor needs to be
> kept wet is a problem for hobbyists, or at least for me. I decided to
> bite the bullet and by an ISFET meter. As Brian pointed out, they can be
> stored dry. The sensors are replaceable, if ever needed and they can
> measure the pH of a single drop of water. They can be calibrated with a
> single drop too.
>
> BC
>
> --
> Barry J. Cooper
> Sweet Home, OR 97386
>
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