as long as you calibrate it, there shouldn't be any limit. I even heard that a touch trigger probe can be used with the absolute arm, but have no idea how.
I know you can use pretty much whatever, but be careful on anything longer than 100mm (or 150 can't remember). A lot of people forget and put the arm up fast and bend the probes each time. At least with the 75 series, Which is the only ones I've had experience with.
