Diziet Sma wrote:And get this.. apparently, there are slide rule emulator apps available for Android devices!

Ok.. of the 6 slide rules available, all are free, and all require NO permissions to be granted, which is something of a rarity these days. However, two (Ivan Perevalov's and Mastermodeling's) are imprecise in action, rendering them useless, and two (Smart Slide Rule and Circular Slide Rule) are very basic, and not much better than toys. That leaves two that are worthwhile having. The memory requirements of both are small enough that it's worthwhile installing the both of them. Both are quite usable even on a smart phone. On a tablet, I think they'd be a joy to use.
Geek Central's Infinirule, while a little basic looking (only 4 scales on-screen), actually has over 40 scales that can selected from, is very handy in that both the stator and slide are 'endless', and that both coarse and precision movements are simple and intuitive in use. It has a lock function and a very powerful zoom feature. Scale readings can be copy/pasted to/from the clipboard. It also comes with a useful help page. Another bonus is that it only requires 110Kb of storage. For a 'power user', this is probably the best of the lot.
Arguably, the best of the bunch for ordinary people, is
Gushiku Studio's Slide Rule. Unlike all the others, this one does display very unobtrusive ads at the foot of the title page, but not when actually in use. It has 10 scales, a very fine precision mode, the display can be zoomed in and out, and it includes a pretty good guide on how to use the scales for various kinds of calculations. Memory requirement is only 1.3Mb. For someone who wants to learn how to use a slide rule without having to buy one first, I'd highly recommend this app.