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$Automatic Digital Refractometer for Food and Beverage Applecation / 디지털 굴절계, % Sugar scale$ $Automatic Digital Refractometer for Food and Beverage Applecation / 디지털 굴절계, % Sugar scale$ $Automatic Digital Refractometer for Food and Beverage Applecation / 디지털 굴절계, % Sugar scale$