Paragon Scientific produces a range of refractive index standards for use in the calibration and verification of all types of refractometer e.g. handheld, Abbe and high accuracy digital instruments.

These range of liquid colour standards includes AOCS-Tintometer, ASTM, Gardner, Lovibond RYBN, Pt-Co and Saybolt Colour, the key colour scales applied to oils, fuels & chemicals.