The usage of standard Autodesk® AutoCAD® commands allows you to divide, to measure and to find out the length of the curve (line, polyline, spline, arc, etc.).
But if it is necessary to do the same not on the whole object but on it's part, you have to do several drawing/editing operations.
This plugin allows you to do such measuring and marking operations on the part of 2D/3D curves without any additional steps. The needed part of the curve is marked by two points after the command starts.