Here is a good range, however, it is best to find what your tank is normally at and try to maintain it there. A good baseline is what your salt naturally mixes at
The ranges mentioned are good targets, though I tend to keep my salinity closer to 1.024.
I have an article talking about the parameter ranges I recommend, however, the key is stability. Try to maintain your aquarium at the same level. Which is why aiming for the parameters your salt mixes at is ideal.