Use an overhead projection calculator to simplify large-group problem solving. The calculator simply rests on the stage of your overhead projector, allowing students to view both display and keyboard. The display responds to every key pressed, allowing students to follow operations and key sequences. Includes period separators, a constant counter, and Key Eliminator™ that temporarily disables specific keys for instructional purposes. Measures 2-3/4"W x 4-3/4"L. No kit available.