Wow, this forum sure hates products from the highly esteemed Fischer Automatische Gussstahlkugelfabrik
What you also can do is measure around the disc with a micrometer if the disk has the same thickness everywhere (its a long shot and should be impossible as wear should solve this, but try and exclude all possible geometry deviations...) and measure with an indicating dial if your disk is still straight (might be difficult with a full floating setup, but maybe you can remove the floating hardware springs and fix the disc solid to the hub with a few small bolts).
How worn are your pads? Or does it occur with both worn and new pads?
As for detecting wear/play on your wheel bearings, jack up the car, and feel with your hand on the spring from the strut and give the wheel a spin.
If you feel vibrations then wear starts to kick in.