The Rudolph Research J257 Wide Range Refractometer was developed by working together with laboratory refractometer users from the polymer, petroleum, petrochemical, pharmaceutical and essential oil industries. The J257 is a fully Automatic, Digital Refractometer, featuring electronic cooling and heating with an extended Refractive Index (RI) measurement range. The J257 is part of the Rudolph Research Rudolph Research Refractometer Product Line.
Rudolph Research’s J257 is designed as a multipurpose automatic refractometer for a broad range of (RI) refractive index measurement applications. Many laboratories need the versatility of a wide range refractometer as they measure many varied samples. The J257 measures the widest possible range of Refractive Index from 1.26 to 1.72 RI, which means that this instrument can measure many materials that a refractometer with only a food refractive index range of 1.33-1.53 cannot.