Replacement Electrode for CHECKER 1 pH Tester
 

Anyone know where I can buy one?

Replacement Electrode for CHECKER 1 pH Tester
 

Grainger.com. or Hanna's website.
Regards,
Joe
Pete > wrote in message >...
> Anyone know where I can buy one?

Replacement Electrode for CHECKER 1 pH Tester
 

Pete > wrote in message >...
> Anyone know where I can buy one?

Be sure to buy it from a place that has fairly rapid turnover, as they
don't have a great shelf life.

And my advice would be, unless you experience has been markedly
different, to not bother with this new probe and invest in a better
meter that has a better probe. My first Checker1 probe did not work
well at all (had been on the shelf far too long before I purchased it)
and the replacement I bought worked great -- but only for about a year
and a half before it went completely haywire, in spite of being stored
properly in the recommended buffer solution. All the advice I've
gotten is that the probe is the most important part of a meter and the
Checker1 probes that you can get for as low as 12 or 13 bucks (US)
just won't cut the mustard for long.

I'm still a little wary of Hanna products given that they sell a
product that from my experience is so unreliable, but people seem to
have had generally excellent experience with the pHep5 and so I'll
probably be buying one of those real soon.

Richard

Replacement Electrode for CHECKER 1 pH Tester
 

Richard,
The Checker is by far the worst thing Hanna makes; it does not compare
to the newer 'stuff'. I have a pHEP3 and a pHEP5, both are great.
The 5 did not exist when I bought the 3 and it still works. I would
buy a 5 again tomorrow, you will like it.

I agree on the Checker probe, they don't last long. In Hanna's
defense, this was designed as at throw away device as I recall. It's
a pretty old design.

I had one for a few weeks and hated everything about it, it was
drifty. The replacement worked but whacked out for no good reason. I
tried cleaning the contacts on the probe since it's a high impedance
device, but that was not it. I took it back to Grainger after trying
the new probe and bought the pHEP3 and used it for 5 years.

That is one good thing about Grainger, they really stand behind what
they sell. Unless you run it over with a truck or beat it with a
hammer, they take electronics back that don't work right without a
bunch of 'guff'. Some places need a special dispensation to do that,
like electronic devices never fail to perform out of the box...

Regards,
Joe

rb
(Richard Kovach) wrote in message . com>...
> Pete > wrote in message >...
> > Anyone know where I can buy one?
>
> Be sure to buy it from a place that has fairly rapid turnover, as they
> don't have a great shelf life.
>
> And my advice would be, unless you experience has been markedly
> different, to not bother with this new probe and invest in a better
> meter that has a better probe. My first Checker1 probe did not work
> well at all (had been on the shelf far too long before I purchased it)
> and the replacement I bought worked great -- but only for about a year
> and a half before it went completely haywire, in spite of being stored
> properly in the recommended buffer solution. All the advice I've
> gotten is that the probe is the most important part of a meter and the
> Checker1 probes that you can get for as low as 12 or 13 bucks (US)
> just won't cut the mustard for long.
>
> I'm still a little wary of Hanna products given that they sell a
> product that from my experience is so unreliable, but people seem to
> have had generally excellent experience with the pHep5 and so I'll
> probably be buying one of those real soon.
>
> Richard

Replacement Electrode for CHECKER 1 pH Tester
 

Replacement Electrode for CHECKER 1 pH Tester
 

How are you calibrating it?

You use a 7 first, then a 4. I then compare to a 10 and 3, all (3, 4,
7, and 10) come out in spec for me... The 7 sets the offset of the
probe; the 4 sets the slope of the line. Both are necessary to
calibrate it. I use some Potassium Bitartrate in distilled water for
a 3.55 sometimes too, just make sure you use more than can disolve in
the water.

Are your buffers moldy? If so, they need replaced.

I may be able to help if you give me additional details if this was
not enough.
Regards,
Joe

> As I mentioned in another post, the pHep 5 we're using is giving
> consistently high results. When we try to calibrate it with 7.0
> buffer solution it throws of the 4.0 calibration. Does this sound
> like an electrode problem, something else?

Replacement Electrode for CHECKER 1 pH Tester