We've recently received some RB5009UPr+S+OUT routers, and are working on integrating them into our operations. Is there a way to distinguish the outdoor version from the indoor version? Both are reporting "model: RB5009UPr+S+" from /system/routerboard/print and "board-name: RB5009UPr+S+" from /system/resource/print.

I know that the OUT version doesn't have the barrel/jack connector, and can see that "jack-voltage" is missing from the SNMP labelled values. It would be a lot easier for us if the board-name: RB5009UPr+S+OUT version could just report that model name. If that's not possible with current RouterOS versions (we're running 7.10), could it be changed in a future release?

Surely you are not referring to a visible distinction ? Otherwise you urgently need new glasses

But you got a point there...
Maybe best to address your question to support.