Check the listing for details. VINTAGE AMERICAN OPTICAL 0-30 Degree BRIX Hand Refractometer - 10430. Condition: Used. Listed at 37.50 USD. The American Optical 0-30 Degree BRIX Hand Refractometer, model 10430, is a handheld refractometer used in various industries for measuring the refractive index of liquids. With a precise range of 0-30 degrees, this device is designed for accurate measurements in lab and industrial settings. The American Optical brand ensures quality and reliability in this essential tool for professionals in healthcare, lab, and dental fields. Please refer to pictures for actual item and item details.