Plastic identifier - hand held

has anyone had a chance to follow any of this work    https://github.com/arminstr/reremeter  
their web site https://re-re.org/  looks a bit 'kickstarterish" but could be promising.
We are working on a color sorter at the moment , Arduino based with a top end color checker and a load of servos and some custom 3D printing
will upload code and schematics soon promise.