As Gunther has said, if you want to check a calibration fluid for an electrical probe you will need to use a electrical probe to read it accurately.
What you can do is read it with probe.
Measure an amount of sea water as comparison (by probe after calibration) and see what it reads, then read that sea water with your refractometer (Which I don't believe are very accurate unless preciously calibrated against a known sample which has ben measured by a lab or accurate probe)
Also note that I have searched over and over again and I have not found one correlation chart to be the same as the other when it comes to PSU Vs MS Vs PPT Vs SG.
The samples should not deteriorate if not used (sealed)as they are not organic. They generally get contaminated by use.
Call me Paul !
Note: I am not GHL staff!
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