Hi

I just calibrated my conductivity probe using the 50ms solution.

All went well but when i put it back in the solution at the same temp as the tank, I got a 49ms reading. I thought that was quite close but decided to calibrate again to see if i could get it more accurate.

I followed the same procedure again (but it had been in rodi water for about 5 mins) and this time the solution read 32.9ms!

I did it one more time and it still read 32.9ms. (wish i had left it alone!)

What have i done wrong? and how can i fix this problem?

thanks