Levenhuk C800 NG Digital Camera, USB 2.0 - Manual (Page 131)

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objects on the Layer Measurement operation.
Unit : The system unit defined by the ToupView. It cannot be deleted.
Current : The Unit selected.
Type : Type of unit. It can be System or User defined.
Scale : Represents the ratio of " Meter by unit ". For example, if the unit is µm, then
"Meter by µm" should be 1000000, the Scale should be e+6;
Add : One can also define his own Unit . Clicking Add••• button and the Add Unit
dialog will be brought up as below: