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$Trans® Handheld Refractometer, Ideal Optical Instrument for Measuring Sugar, Alcohol, and Salt Conc. with Automatic Temp. Compensation, 휴대용 굴절계$ $Trans® Handheld Refractometer, Ideal Optical Instrument for Measuring Sugar, Alcohol, and Salt Conc. with Automatic Temp. Compensation, 휴대용 굴절계$