Define how status is displayed in UIs (add units etc.).

def get_status_display(self, **kwargs):
        """
            Define how status is displayed in UIs (add units etc.).
        """
        if 'value' in kwargs:
            value = kwargs['value']
        else:
            value = self.status

        if self.show_stdev_seconds:
            stdev = self.stdev(self.show_stdev_seconds)
            return f'{value}±{stdev:2.2}'
        else:
            return str(value)