This .NET class wraps the AcDbAnnotationScale ObjectARX class. 

That class represents a single annotation scale defined in a drawing in the form of an object context. Objects of the class are obtained from the AnnotationScale context collection.

Autodesk.AutoCAD.DatabaseServices.ObjectContext
    Autodesk.AutoCAD.DatabaseServices.AnnotationScale

Public Class AnnotationScale
Inherits ObjectContext

public class AnnotationScale : ObjectContext;