Re: [Killietalk] pH meter

[Barry Cooper <barry_cooper at mac.com>]

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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