Best Refractometer?

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The pocket one from drsfostersmith.com works great. The only difference in all of those they have is one doesn't require a screwdriver to calibrate and the other has a built in light. I think for most of us, the $50 one is perfect.
 
I got mine on ebay. The one I got is running around 30 on ebay.
 
Hard to go wrong with a refractometer. The $30 ones work better than of the cheap lastic swing arms and as well as the $150 ones. As long as it's an ATC (automatic temperature) you should be fine.
 
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