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