This is a general term for a meter designed specifically for educational demonstrations. It likely incorporates features that allow instructors to easily explain the inner workings and components of the meter to students.
Interscale Demonstration Meter:
This type of demonstration meter may have additional features that allow for the easy interchangeability of scales. This feature enables instructors to demonstrate how different scales affect the readings on the meter and how they correspond to different units of measurement.
Vertical Demonstration Meter:
This type of meter is designed with a vertical orientation, which may make it easier for instructors to present information to students in a classroom or laboratory setting.