Sper Scientific 300038 Software for 300037 Refractometer - Manual (Page 9)

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There are several available dimensions (units of measure) used for taking Refractometer measurements, depending on
the application and type of substance being measured. A common unit of measure is percentage (%) by weight. Use a
high resolution digital balance to produce solutions at various concentrations and equate them to the percentage of
dissolved solids by weight. For example:
1ml of H
2
O is weights approximately 1g. A solution of 9g of water and 1g dry solids produces a 10%
concentration. Pure distilled water (0% dissolved solids) is 1.3330nD. A 10% solution (NaCl) is 1.3505nD.
After creating your concentrations, measure them with the nD scale, and collecting the results, the next step is to enter these
key-values into the software.
Enter Your Key-Values into the Software
1. Click on the Custom Scale icon on the Toolbar.
Note: To open Custom Scale, the Refractometer must be connected to the computer and turned on. If errors
occur, verify the serial port settings (see: Serial Port Configuration above)
2. The Custom Scale screen is divided into a functions and chart section.
Figure 7