Returns the units ("N/mm˛", "m/s", etc) of the value that will be returned by getValue for the given named variable. Optionally, an UnitSet object (or its name) can be passed to control which system of units (e.g. mm/m/inch) will be used to build the returned string. If not given, the database's current unit system will be used.
| varName | string | name of the value (e.g. "E") |
| units | optional IFUnitSet | unit system to use. If not given, database units will be assumed |
| Return value | string | the returned string |
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