EL-506 Scientific Calculator

Direct Algebraic Logic allows students to enter the elements of an expression in the exact order they appear in the textbook. Extra large display 12 digit, 2 line display - 1 line equation and 1 line numeric. With multi-line "Playback"
the user may then "playback" the expressions and substitute new numeric values after getting an answer. Additional features include differential and integral calculus functions, 469 functions, and hard case.