TMRC Exotics
Aquarium Advice Addict
I zeroed it with my rodi. Tds 14, that's what absolute zero for the tank is anyways.. instructions didn't mention fluid so I'll stick with the source water. Hydrometer was actually spot on but I won't be using it any more.
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Ironically that was my experience as well, my hygrometer was very close, but I have heard horror stories.
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