Well the sensorprobe web page describes it as having both a web interface and an snmp interface so you may be able to use either the http-request node to interrogate the web interface or the snmp node (http://flows.nodered.org) to ask it for snmp info.
But if you already have the info (where you said you "already did that") - can you pass it to a debug node to show us what you have got so far ?
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