Real КЛ-1 has additional A scale on front face and the whole back face (which is not implemented at all). However even this simplistic model will allow to you to try out slide rule with a single scale.
On a real КЛ-1 pointers are black. I made them blue to make them read easier.
Depending on resolution of your screen you may wish to scale image to make larger or smaller. Enter the size in pixels and push the button. Resizing does not reset or move pointers and dial, so you can use this feature to zoom in to read the result and then zoom back out.