We have had measurement for awhile in pro and we decided to bring some of this utility to the basic version of Scribble Maps and API.
While the dimensions won't be shown directly on the map like in pro, the dimensions can be seen while drawing the shapes and then after using the move/edit tool. We know that the line measurement tool is used a lot in the class room and we hope that this new feature will be just as useful.
You can also switch the measurement style from Metric to Imperial by using the gear icon in the bottom left of the editor.
If you have any suggestions or features that you think would make this or Scribble Maps in general even better please do not hesitate to use the feedback tab on the editor.