Opened hood last night just to check for anything strange, found this piece laying over my driver side strut tower.
Can't remember if this is a factory stick for one of the fluids, or if it might have been left in by a service tech (had in to Subaru for oil/rotation a couple weeks ago, haven't looked under hood since)
Says 'Level Gauge', '>PE-LD<' then further down there is an indicator for 'Normal' and 'Low'.
I feel like I saw this in use somewhere in the car previously.
Thanks budskis!