With IPHost Network Monitor you can run simple snmp requests against a HP device in your network.
serial-number
serial-number
1.3.6.1.4.1.11.2.3.9.4.2.1.1.3.3
Identifies the serial number for the device. If the SERIAL-NUMBER object is set by the user, then setting the object does not need to be protected. If the SERIAL-NUMBER object is set at the factory, then the SERVICE-PASSWORD object must be set correctly before the SERIAL-NUMBER object is writable. If this is a writable object, the POS should indicate the maximum supported string length. If possible, encode the serial number in a symbol set (like Roman-8) that matches the ASCII character set and limit the characters used to ASCII characters. Additional information: This value IS AFFECTED BY NVRAM resets, it is set to the default value of XXXXXXXXXX, when a NVRAM init is done.
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IPHost Network monitor allows you to monitor serial-number 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 wireless switches right now.