HP35S has replaced the HP33S which replaced the HP32S
The new hp35s - get professional performance from HP's ultimate RPN scientific programmable calculator - ideal for engineers, surveyors, scientists, and university/college students. Scientific projects require accuracy, functionality and dependability for success. The hp35s deliver this with features that include 30KB user memory, RPN and algebraic logic, a two line display and the time saving HP Solve application.
HP35S User Guide English