def check_var_units(self, ds):
        '''
        Checks each applicable variable for the units attribute

        :param netCDF4.Dataset ds: An open netCDF dataset
        '''
        results = []
        for variable in self.get_applicable_variables(ds):
            msgs = []
            # Check units and dims for variable
            unit_check = hasattr(ds.variables[variable], 'units')
            no_dim_check = (getattr(ds.variables[variable], 'dimensions') == tuple())
            # Check if we have no dimensions.  If no dims, skip test
            if no_dim_check:
                continue
            # Check if we have no units
            if not unit_check:
                msgs.append("units")
            results.append(Result(BaseCheck.HIGH, unit_check, self._var_header.format(variable), msgs))

        return results
Checks each applicable variable for the units attribute

        :param netCDF4.Dataset ds: An open netCDF dataset