@classmethod
def validrange(cls, v):
    """Check that all values are within VALIDMIN/VALIDMAX, or FILLVAL

        Compare all values of this variable to `VALIDMIN
        <https://spdf.gsfc.nasa.gov/istp_guide/vattributes.html#VALIDMIN>`_
        and ``VALIDMAX``; fails validation if any values are below
        VALIDMIN or above ``VALIDMAX`` unless equal to `FILLVAL
        <https://spdf.gsfc.nasa.gov/istp_guide/vattributes.html#FILLVAL>`_.

        Parameters
        ----------
        v : :class:`~spacepy.pycdf.Var`
            Variable to check

        Returns
        -------
        list of str
            Description of each validation failure.

        """
    return cls._validhelper(v)
