That is what I thought I did...

I remixed the 4.00 and the 7.00

The meter reads 7.00 in the 7.00 solution
It is reading 4.70 in the 4.00 solution

I tried to recalibrate it, no go...

I do not know how else to confrim it?
What should distilled water read?

My fish tank has always read 8.20
It is reading 7.5 now.. I think this is wrong.



RD wrote:
> On Sep 8, 5:16 pm, Borek
> > wrote:
>> On Sat, 08 Sep 2007 19:32:38 +0200, homebrewdude
>>
>> > wrote:
>>> 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-meter.info/pH-electrode

>
> 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
>