def count_per_m(self):
        """
        Returns the number of tacho counts in one meter of travel of the motor. Tacho
        counts are used by the position and speed attributes, so you can use this
        value to convert from distance to tacho counts. (linear motors only)
        """
        (self._count_per_m, value) = self.get_cached_attr_int(self._count_per_m, 'count_per_m')
        return value