Conductivity probe?

[tmccaf]

My ghl probe is reading 29.8 PSU and my Hanna Salinity checker reading at

42.7 PSU; I calibrated both today

I also checked with my VEEGEE STX 3 and reading at 43. I am guessing need new conductivity probe or I am doing something wrong.

I put the solution in my tank for 3 hours; I left out probe for 1 hour to dry, I then started to calibrate. I took the temp of calibration solution with external temp and it came up 25.4C I put that in the profilux. I did calib tolerance 1 and even tried 2 and still way off from both my refractometers.

[tmccaf]

I recalibrated this time kept solution in tank while it calibrated and now working.

[tmccaf]

Now the probe is not showing correct value. Is the probe maybe in need of replacement? Is there away to tell? Thanks

[Vinny]

Check for any cracks on the glass prongs.
You can leave the probe sitting in 50mS fluid for at least an hour to see if the values change outside of the 50ms reading.