Teacher/Lecturer - for classroom teaching It is like an infinitely extended pointer that makes it easy for you to point the blackboard at any corner of the classroom.
Business People / Conference Speakers - for product presentations and conference presentations to make your presentations easier and more comfortable with customers.
Museum/Exhibition Hall/Guide--When you are in the face of the "reaching hand" goal, it can help you easily and accurately indicate the target.
Mining site/construction workers - for accurate indication/measurement of buildings over long distances. Avoid approaching dangerous areas. Let you behave like a live commander.