I have been calibrating my aquacontroller Jr but have been getting different readings.

I would like to know how long should I leave the PH probe in the calibration liquid.

First I think I did it too fast and I was getting high readings and now I took to long and It now is too low.

Please let me know what Im doing wrong.

Thank you,

I leave it for about 5 minutes. You should see it stabilize. You need to make sure you are using both a low solution (like 4.0) and a high solution l(like 10.0). It should not matter if you leave it too long (within reason).

After I calibrate I stick it back in the solution to see it set right on 10 or real close on a 10 solution. Also, make sure yiou rinse between solutions in some RO water.