On Sep 10, 7:12 pm, hap wrote:
On Sep 8, 12:32 pm, 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"

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.

water is not a good buffer, if you want something close to 4 try cream
of tartar at 3.54 pH. Cheap buffers can be had from Hydrion. This
meter is accurate to 0.05.

As to the OP, email Hanna, they are good at customer support. I have
this meter and never had this issue, mine is around 5 years old.

Joe