With IPHost Network Monitor you can run simple snmp requests against a HP device in your network.
override-media-size
override-media-size
1.3.6.1.4.1.11.2.3.9.4.2.1.4.1.1.3
Sets the media size that is to be used in place of the currently requested media size. Additional information: When a request is received to print on a size and type of media that is not currently available, this object contains the desired size as set by the print job. This object should be set to a media size that is currently available to the printer. If a paper mount request is not pending, attempting to get or set this object will cause to be returned.
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IPHost Network monitor allows you to monitor override-media-size on Hewlett Packard device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.