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Not really. That'll be 0 ppt and won't be calibrated correctly for your measurement. There is a DIY solution you can do if you have a scale. https://www.reef2reef.com/threads/diy-salinity-calibration-solutions.220052/thank you for that comprehensive response. Can i just use rodi water to calibrate? I don’t have calibration fluid.
thanks for your feedback.I love mine, but I know others who don’t like them. I haven’t needed to calibrated mine in years, but I do regularly test it with a diy validation solution.
Also, for the Milwaukee digital refractometer it has to be calibrated at 0 with either distilled or rodi water.
I like mine but have a standard refractometer as back up.
dang!Amazon $150