def METHOD_NAME(self):
    """
    Retrieves the low threshold temperature of thermal
    Returns:
        A float number, the low threshold temperature of thermal in Celsius
        up to nearest thousandth of one degree Celsius, e.g. 30.125
    """
    attr_rv = self.__get_attr_value(self.low_th_attr)
    if (attr_rv != 'ERR'):
        return float(attr_rv) / 1000
    else:
        return None