What does it mean "CALC." / "SAMPLE" in BM display?

This screen indicates if BM is Calculus or reference mode and the actual sample number. Each database (calculus and references) has 2600 samples.

When BM starts operating, it will be shown on this screen “Reference“ the sample number. When all of the 2600 samples in the bank be filled, BM will start to indicate “Calculus” and the sample number. When the 2600 samples are registered, a new sample will take place of the older one in the BM memory.