The Rudolph Research J257 Wide Range Refractometer was developed by working together with laboratory refractometer users from the polymer, petroleum, petrochemical, pharmaceutical and essential ...

The Fisher Scientific™ Abbe Bench-top Refractometer measures refractive indices of liquid and solid samples at D-line (589nm), featuring a combination of the Brix and refractive index (nD) scales.

Warren P. Valentine began making refractometers when World War I limited the import of European instruments into the United States. By 1920 the National Bureau of Standards reported that Valentine's ...