Refractometer

Yep, I'd get the cheaper one. Be sure to buy some calibration fluid (you can get it on Ebay for about $4). Once it's calibrated, the cheap refractometer will be no different than a more expensive one.
 
My feeling would be hurt if I had any.
I got that cheaper refractometer that you linked to,except I paid a whole lot more for it.
 
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