Test kits are the tip of the iceberg in keeping salt water tanks, you asked what you should be using, Elos, Salifert and Hanna have been mentioned. If you want to have accuracy these are the ones to choose from. Oh and by the way most of the folks that have made comments are seasoned salt water reefing people, I've been at salt water 4 years and am always asking for advise on this forum, you never know it all and there's lots of knowledge here I find.
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Hey! I never "LEFT" the hobby, just doing fresh water now. Which is still listed as part of Canreef if I'm not mistaken. 
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