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.

AOCS Tintometer colour reference standards are manufactured and certified by The Tintometer Limited. These colour standards have been manufactured and tested under the control of Tintometer's ISO 9001 Quality Management System.

Lovibond RYBN colour reference standards are manufactured and certified by The Tintometer Limited. These colour standards have been manufactured and tested under the control of Tintometer's ISO 9001 Quality Management System.

Our certified pH buffer range include solution for pH 4.00, 7.00 and 10.00 certified at either 20 °C or 25 °C, specifically used for verification and calibration checks of pH meter instruments.