For refractometer performance verification, traceable to NIST/ICUMSA Calibration Oils from Bellingham + Stanley.
Sold as a pack of 5.
Calibration Oils from Bellingham + Stanley come in boxes of 5. They are organic compounds that cover the range 1.47 -1.56 Refractive Index and cover the top end of the Brix scale. These Calibration Oils have a shelf-life of 12-months. They are ideal for calibrating refractometers that have temperature control in both food and industrial applications.
The United Kingdom Accreditation Service (UKAS) is one of the signatories to the International Laboratory Accreditation Co-operation (ILAC) Arrangement for the mutual recognition of calibration certificates, such as NVLAB in the USA or DAkkS in Germany.