Check out a Digital Aquatics Reefkeeper Lite or reefkeeper Lite PLUS. It can do all that and more at a very reasonable price. I am very happy with mine.
As for monitoring salinity, it can do that, but why do you need to watch it constantly? A refractometer is easy and fast. Salinity doesn't change often, unless you are topping off manually, or don't measure your salt water for changes.
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