DOC: WMI: Win32_TemperatureProbe.CurrentReading Is Not Populated (306852)

SUMMARY

Most of the information that the Win32_TemperatureProbe WMI class provides comes from SMBIOS. Real-time readings for the CurrentReading property cannot be extracted from SMBIOS tables. For this reason, current implementations of Windows Management Instrumentation (WMI) do not populate the CurrentReading property. The CurrentReading property's presence is reserved for possible future use.

The structure of the SMBIOS Temperature Probe group is type 28, as documented in section 3.3.29 of the following SMBIOS specifications: This group is defined as follows in SMBIOS 2.2:

Offset	Name	Length	Value	Description
00h	Type	BYTE	28	Temperature Probe indicator.
01h	Length	BYTE	Varies	Length of the structure, at least 14h.
02h	Handle	WORD	Varies	The handle, or instance number, associated with the structure.
04h	Description	BYTE	STRING	The number of the string that contains additional descriptive information about the probe or its location.
05h	Location and Status	BYTE	Bit-field	Defines the probe's physical location and status of the temperature monitored by this temperature probe.
06h	Maximum Value	WORD	Varies	The maximum temperature readable by this probe, in 1/10 degrees C. If the value is unknown, the field is set to 0x8000.
08h	Minimum Value	WORD	Varies	The minimum temperature readable by this probe, in 1/10 degrees C. If the value is unknown, the field is set to 0x8000.
0Ah	Resolution	WORD	Varies	The resolution for the probe's reading, in 1\1000 degrees C. If the value is unknown, the field is set to 0x8000.
0Ch	Tolerance	WORD	Varies	The tolerance for reading from this probe, in plus/minus 1/10 degrees C. If the value is unknown, the field is set to 0x8000.
0Eh	Accuracy	WORD	Varies	The accuracy for reading from this probe, in plus/minus 1/100 of a percent. If the value is unknown, the field is set to 0x8000.
10h	OEM-defined	DWORD	Varies	Contains OEM- or BIOS vendor-specific information.
14h	Nominal Value	WORD	Varies	The nominal value for the probe's reading in 1/10 degrees C. If the value is unknown, the field is set to 0x8000. This field is present in the structure only if the structure's Length is larger than 14h.

WMI provides this information in the Win32_TemperatureProbe class.