I haven’t used a CadCARD, don’t really have a need for it, must admit was rather surprised there is still demand for this kind of analogue calculator. Rather cool in a retro way!
Slide Charts for AutoCAD - 4 Versions – NEW US Version
US ANSI & Architectural "Junior" Version
US ANSI & Architectural Converted to Metric Version
Image credit: CadCARD.com