I can use some help with this one.
I have calibrated both my refractometer (using 35ppt refractive index standard solution) and my conductivity probe (using 53,000 uSiemens/cm solution). After calibration, the apex probe reads the calibration solution as 34.9 ppt. When I place the probe in the tank, it reads my tank water at 28.3. The probe wire is isolated from the other wires, thus no electrical interference. With the refractometer, my water is 1.026.
My tank is maintained at 77-78 degrees.
Which measurement is correct?
I tend to trust the refractometer more
I have calibrated both my refractometer (using 35ppt refractive index standard solution) and my conductivity probe (using 53,000 uSiemens/cm solution). After calibration, the apex probe reads the calibration solution as 34.9 ppt. When I place the probe in the tank, it reads my tank water at 28.3. The probe wire is isolated from the other wires, thus no electrical interference. With the refractometer, my water is 1.026.
My tank is maintained at 77-78 degrees.
Which measurement is correct?
I tend to trust the refractometer more