Q: How often do we need to calibrate the refractometer?

A: Approximately every 1 to 4 weeks

 After the refractometer has been calibrated before the first use, the interval depends primarily on the use.

Frequently used instruments should be recalibrated approximately every 1 to 4 weeks. Less used models

can have up to 12 weeks in between.Refractometers should not be exposed to wet environments.

Only the prism surface should be wetted with sugar solution or water. After each read- ing or before

storing the refractometer, the prism should be thoroughly cleaned with water and dried.