Refractometer/rɪˌfrækˈtɑːmɪtər/ Definition 1 of 1Pro Tip 1/3Scientific Tool Used by professionals like winemakers, not in everyday conversation. A chemist might say: 'We'll use the refractometer for this solution's analysis.' Pro Tip 2/3Precision Instrument Indicates a high level of accuracy in specialized fields. Research labs require a precise refractometer to study liquid samples. Pro Tip 3/3Measuring Device Use 'refractometer' when referring to measuring refraction, not weight or volume. While a scale measures weight, a refractometer measures refraction.