I'm not seeing it in my library, and it's not in the AC11 Library Preview PDF. There is an Elevation Marker NCS 11, but it's not associated with the IE Tool. (sorry, no help)
MacBook Pro Apple M2 Max, 96 GB of RAM
AC27 US (5003) on Mac OS Ventura 13.6.2
Started on AC4.0 in 91/92/93; full-time user since AC8.1 in 2004