Check this one out:
Premium Blue Refractometer - RHS-10ATC: Premium Aquatics Myself and many others have one and love it, very easy to use and accurate! Even has ATC (automatic temperature compensation) A good refractometer is the only way to go IMO, $45 compared to $10 is a $35 difference... if you loose a single item of livestock you would already pay for the difference chances are. And you might want to get used to buying stuff for your tank online, I've found that sometimes you have to.
Oh, and Premium Aquatics is a 3reef sponsor, so if you get the one from them you are helping the cause!!
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55 gallon slowly growing reef aquarium, 85 lbs. live rock, 2 1/2" sandbed, 1 False Percula Clown, 1 Sixline Wrasse, 1 Mandarin Goby, Tetratec PF500 filter, 2 110 watt URI Super Actinic VHO actinics, 2 250 watt metal halides with Reef Optix 2 reflectors powered by Blue Wave 3 ballast, born 1/3/08
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