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hanna pH checker
>Date: Tue, 06 Apr 1999 14:06:13 -0700
>From: Sherlock Wong <wong at dt_wdc.com>
>Subject: PH Meter
>
>Does anybody have any user comments on the
>Checker ph pen? It is around $50 from That Fish
>Place, and it is $35 direct from the manufacturer,
>
>http://www.hannainst.com/products/prodline/tester.htm#pH
>
>They also have a pHep3 pen for $50, which has alot more
>features.
>
>Thanks
>Sherlock Wong
>
Sherlock,
I bought this pH pen from Hanna about two years ago. It works fine,
and I got about a year of good service out of the probe. I do
recomend that you build a "soaker bottle" to store the probe tip in so
that it stays wet ALL THE TIME. I ruined mine by letting it dry out.
Hanna provides a little "boot" that you are supposed to fill with
storage solution and place over the probe tip. This is suficient if
you use the probe every day and replace the storage solution every
day, but if you only test weekly or so, the solution will dry up and
leave the probe dry (which damages it). When my probe quit working
properly (from being dried out), it began to drift slowly and no
longer gave a decisive reading. It also failed to callibrate at the
same spot repeatedly (ie, it would read 7.0 in the 7 buffer, then
after checking the tank pH it would read 6.4 in the same buffer).
Hope it helps,
Matthew Shaffer
NCSU Raleigh
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