Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Should've listened to the pro...

I bought this refractometer for homebrewing beer against the recommendation of my LHBS owner, who argued they are far more handy for wine makers. Either way, I liked the idea of simply taking a few drops of fermenting/ed beer to check my gravity. Our first batch measured higher brix than we expected- we just accepted we screwed something up while brewing. Then another batch that was clearly different SG and FG came out with the same brix as the prior batch! We then tested it against our hydrometer (should have done this in the first place) and, to our surprise, got pretty significantly different results.I wish I would have listened to the pro...