The non-permanent marker board eraser apparatus provides a basic design and construction that exposes minimal moving parts to erasure debris. Then, the second grooves are inspected. When the main translator requires the external reference data, it performs the output data process using the external reference data managed in the resource management table. The counterbalance assembly has a counterbalancing mass portion and a coupling arm that are fixed with respect to one another, and a pin that protrudes from a side of the counterbalancing mass portion.