I had an issue with a Hanna checker also (but I've only had one unit to test). I agree, getting salinity/specific gravity measuring tools to agree with one another is difficult. I recently discovered that the German glass hydrometer that I relied on all these years has been changed, the one brand I saw no longer has a range from 1.0000 to 1.0040, it seems to only read in the range of marine aquariums.
Have you seen my article?
https://www.reef2reef.com/ams/measuring-salinity-specific-gravity-in-aquariums.867/