Surveyor is used for
The surveyor may be used for surveying the diagnostic cast, recontouring abutment teeth on the diagnostic cast, contouring wax patterns, measuring a speciﬁc depth of undercut, surveying ceramic veneer crowns, placing intracoronal retainers, placing internal rests, machining cast restorations, and  surveying and blocking out the master cast.
Surveying diagnostic cast
Contouring wax patterns
Measuring undercuts
All of the above