I've been using a Hydrometer by Instant Ocean, it has been reading my aquarium at 1.025 for 2 weeks. Today i bought a refractometer by Red Sea and after calibrating I tried it and it gave me a reading of 1.029 !! So then I again tried my hydrometer and it again said 1.025. So I took the Refrac and tried it twice on DI water, went to 0. I then tried it on a diffferent bottle of DI water and again gave me 0. Then back to my tank and 1.029. So it leads me to believe it must be correct? Are Hydrometers really that bad?
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