That’s nothing new but can be useful to anyone. A good tool for make better your scratch-mixer.
InnoFADER has a whole arsenal of adjustments as well as an almost universal plug and play architecture, making it the most user friendly fader in the DJ scene.
You can install in a lot models of mixers. Here the mixer models compatibility list.

Product by Audio Innovate.
Fit instructions.
All info.

I have fitted a Technics SH-DJ1200 (little laborious, but practicable!), a Vestax QFO le and a Vestax PMC-06 (very easy to).

enjoy yourselves!