I've used this to calibrate my Hanna salinity meter. Based on hygrometer and refractometer readings even after using this the Hanna reads much lower. Based on the Hanna readings my salinity was reading 1.025 but was actually1.037 and killed my fish!
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I would definitely recommend adding these little guys to your tank. They are very playful and entertaining. My three were very healthy and quickly adjusted to my tank.
