I just opened up my new refractometer and out of the box it's saying my RO/DI water has 0ppt / 1.0 SG and my tank has 1.027 SG. Should I even bother trying to calibrate this? Some of the Amazon reviews state they took it straight to the LFS to test and theirs were already calibrated...
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Aquarium Salinity: How to Measure and Why It's Important
Salinity is one of the most important parameters measured in reef aquaria. It controls not only the salt balance between an organism and its surrounding environment, but also the levels of a host of ions in seawater that aquarists neither measure nor control independently. Consequently...