Refractometers are temperature compensated by their nature.... you put 3 drops of your aquarium water on the plate... wait 15 - 30 seconds... then look through they eye piece at a bright light... there you will see a scale of numbers where your salinity can be read... After comparing an AP and Coralife hydrometer to my Refractometer, I found the Coralife one to be out by <3ppt and the AP one to be out >1ppt... I STILL use these for daily visual checks as they are too easy to use... and just use the Refractometer for calibrations and precise readings.
Steve! I woulda thought YOU of all people would never do that! Right now I have an elegance that has been cranky for over a week now... why? Because I scraped my %$#@&&!! centre brace, and some salt creep broke off and snowed into the tank... so I AM speaking from experience on this one too... but just MY experience... I guess some people get away with some things... 
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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