Question: 

 

What is the difference between SG and Salinity, how to I measure my salt level correctly?

 

Answer: 

.

The best method for measuring SG or sality is a refractometer.

It is however very important that it is a seawater refractometer that is used not a brine or saltwater refractometer. See the article in the link below for information on refractometers and the difference between SG and salinity.

Salt level and Refractometers explained.