The game's collection data lists Secondhand Survey Tools as sold by a vendor NPC in Valdrakken.
Vendor
Zone
Map
Waypoint
Other items it sells
NPC #199599
Valdrakken
-
-
792
Vendor NPC, zone and position come from the client's collection source tables (CollectableSourceInfo and CollectableSourceVendorSparse); coordinates are the in-game map readout.
Build history
First seen in build 12.0.7.68887 (Midnight (patch 12.0.7)).
Blizzard numbers items as they are created, so the named items next to ID 199900 (199894 to 199905) were usually added in the same batch as Secondhand Survey Tools: the same quest line, zone, vendor or reward set.