I tried to calibrate my ph56 meter and here's what I get:
-7.01 solution says REC and then USE
-I then put into 4.01 solution, here the 4.01 REC and then WRNG message comes up (spelling)
-then it reads 4.01 REC and stays there for a few seconds
-it finally comes up calibrated to 4.00
-however, I leave it in the 4.01 solution and after a couple seconds it reads 3.98
This solution should not be old, over 6 months but less than a year
I never use the storage solution (mistake?) but leave probe in spring water with the cap
Tried this twice and same thing happened.
Do I need to add .02 to my pH readings since it is calibrating below the 4.01?
NOTE: when I turn it on while in the 7.01 solution it reads 7.06, so I know it is not really calibrated and off by .05 decimal.
Thoughts?
-7.01 solution says REC and then USE
-I then put into 4.01 solution, here the 4.01 REC and then WRNG message comes up (spelling)
-then it reads 4.01 REC and stays there for a few seconds
-it finally comes up calibrated to 4.00
-however, I leave it in the 4.01 solution and after a couple seconds it reads 3.98
This solution should not be old, over 6 months but less than a year
I never use the storage solution (mistake?) but leave probe in spring water with the cap
Tried this twice and same thing happened.
Do I need to add .02 to my pH readings since it is calibrating below the 4.01?
NOTE: when I turn it on while in the 7.01 solution it reads 7.06, so I know it is not really calibrated and off by .05 decimal.
Thoughts?