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> It says "use" 7.01
> Then it says "use" "4.01"

> After a few seconds it says "WRNG"

> > I am trying to calibrate my Hanna ph meter.
> > I mixed up new solutions of 4.00 and 7.00
> > I hold on till CAL shows up.

> > It says "use" 7.01
> > Then it says "use" "4.01"

> > After a few seconds it says "WRNG"

> Assuming you have put the electrode in correct solutions as asked by the  
> display content - something went wrong in the second solution. I don't  
> know Hanna meters, but it is very unlikely to me that they don't show  
> error message at once after dipping electrode into pH 7.01 solution - pH  
> meter must recognize the solution before moving to the next one.

> Do you have pH stripes, to check if the second solution pH is really  
> around 4 (and the first one around 7)? Don't bother with high accuracy,  
> just check if they are around their proper values.

> Borek
> --http://www.chembuddy.com/?left=BATE&right=pH-calculatorhttp://www.ph-...

> I mixed up new solutions of 4.00 and 7.00

> I hold on till CAL shows up.

> It says "use" 7.01
> Then it says "use" "4.01"

> After a few seconds it says "WRNG"

>>> I am trying to calibrate my Hanna ph meter.
>>> I mixed up new solutions of 4.00 and 7.00
>>> I hold on till CAL shows up.
>>> It says "use" 7.01
>>> Then it says "use" "4.01"
>>> After a few seconds it says "WRNG"
>> Assuming you have put the electrode in correct solutions as asked by the  
>> display content - something went wrong in the second solution. I don't  
>> know Hanna meters, but it is very unlikely to me that they don't show  
>> error message at once after dipping electrode into pH 7.01 solution - pH  
>> meter must recognize the solution before moving to the next one.

>> Do you have pH stripes, to check if the second solution pH is really  
>> around 4 (and the first one around 7)? Don't bother with high accuracy,  
>> just check if they are around their proper values.

>> Borek
>> --http://www.chembuddy.com/?left=BATE&right=pH-calculatorhttp://www.ph-...

> I have this meter and it's worked well for me for 3+ years.  The 2-
> point calibration proceeds first with the 7.01 buffer then the 4.01.
> If you see 'WRNG', it means that the meter can't recognize your
> buffer.  So either you've tried to do it out of sequence or your
> buffers are not what they're supposed to be.  If you have commercially
> purchased buffers, try again in the reverse order.  If you've mixed
> the buffers yourself, you should re-examine how you did it to make
> sure it's right.

> RD

> > I am trying to calibrate my Hanna ph meter.

> > I mixed up new solutions of 4.00 and 7.00

> > I hold on till CAL shows up.

> > It says "use" 7.01
> > Then it says "use" "4.01"

> > After a few seconds it says "WRNG"

> Maybe the probe needs replacement?

> This makes me raise a question I was wondering about.  Keep in mind
> I'm small hobbist wine maker and a cheap skate.  I've heard that you
> can use 2 common household items with a PH at approx 7 and 4 instead
> of the calibration packs.  The hanna ph meter reads to 0.01 but is
> only accruate to plus/minus 0.2.  So very good accuracy of the test
> solution isn't that important.  A bottle of water (not tap) would work
> for the 7 range.  Any ideas what could work for the higher acidic
> range?  Windex, dish soap, Coke or Pepsi??  I guess you'd have to know
> what the PH of each was before you calibrate.

> > I am trying to calibrate my Hanna ph meter.

> > I mixed up new solutions of 4.00 and 7.00

> > I hold on till CAL shows up.

> > It says "use" 7.01
> > Then it says "use" "4.01"

> > After a few seconds it says "WRNG"

> Maybe the probe needs replacement?

> This makes me raise a question I was wondering about.  Keep in mind
> I'm small hobbist wine maker and a cheap skate.  I've heard that you
> can use 2 common household items with a PH at approx 7 and 4 instead
> of the calibration packs.  The hanna ph meter reads to 0.01 but is
> only accruate to plus/minus 0.2.  So very good accuracy of the test
> solution isn't that important.  A bottle of water (not tap) would work
> for the 7 range.  Any ideas what could work for the higher acidic
> range?  Windex, dish soap, Coke or Pepsi??  I guess you'd have to know
> what the PH of each was before you calibrate.

>>> I am trying to calibrate my Hanna ph meter.
>>> I mixed up new solutions of 4.00 and 7.00
>>> I hold on till CAL shows up.
>>> It says "use" 7.01
>>> Then it says "use" "4.01"
>>> After a few seconds it says "WRNG"
>> Maybe the probe needs replacement?

>> This makes me raise a question I was wondering about.  Keep in mind
>> I'm small hobbist wine maker and a cheap skate.  I've heard that you
>> can use 2 common household items with a PH at approx 7 and 4 instead
>> of the calibration packs.  The hanna ph meter reads to 0.01 but is
>> only accruate to plus/minus 0.2.  So very good accuracy of the test
>> solution isn't that important.  A bottle of water (not tap) would work
>> for the 7 range.  Any ideas what could work for the higher acidic
>> range?  Windex, dish soap, Coke or Pepsi??  I guess you'd have to know
>> what the PH of each was before you calibrate.

> That doesn't work if you can't set the calibration value on the meter
> to what the pH of yout household item "buffer" is - for example, for
> cream of tartar solution you'd need to set the calibration point of
> the pH meter to 3.53-3.55 instead of 4. You can't do that on pHep 5.

> Where the cream of tartar can come in useful is in checking the
> accuracy of the calibration. I ran into this actually on the weekend
> because my buffers are well past the expiry date on the label, so I
> measure a cream of tartar solution after calibration to make sure I
> wouldn't dump in tartaric acid into a wine that didn't need it. It
> measured at 3.55 so spot on.

> Pp

>> They are stable for a pretty long time - afterall, they
>> are buffers.

> pH 4 buffers are stable, pH 7 more or less stable, pH 10 buffers are
> unstabel if they are not kept airtight. Once again that's CO2 in action.

> But you are absolutely right that it doesn't make sense to look for
> household items, as relatively precise buffers can be bought cheap.

> Borek

> Now it calibrates fine with no errors....

> I also bought some pH storage solution. Hopefully I get more then 2  
> years on this probe.