Refractometer or conductivity probe?

[alekslyse]

My refractometer won't give an ms reading only ppt or sg. The tank is currently at 26c and 51.9ms according to P4. Refractometer gives 1.026 (34ppt) @ ~20c

Check your temperature probe. @ 26 degrees 51.9 = 1.0251 @ 25 degrees = 1.0257 - use a glass of rodi icecubes and water to find absolutely zero on your probe in case its off