The value/unit class of the detail information
specified in this row of the table.
Usage: Used to select a textual convention for
specifying the value unit of this device detail.
Usage: Also used to specify which of
xcmHrDetailValue[Integer|OID|String] are used to
contain the detail value.
Usage: Typically the value of xcmHrDetailUnitClass is
listed explicitly in the description of the
XcmHrDevDetailType enumeration. In that case, the
agent SHALL populate this object with the listed
enumeration and a management tool does not have to
check this object to determine the unit class.