The Proxxon DA 3 digital read-out is easily fitted to the FF 500 milling machine. Mechanical play (backlash as well) is ignored. And, the revolutions of the handwheels do not have to be counted for long travel distances. Reasonable for repetitive processing as in addition to the zero point a second start point (incremental) can be set anywhere. The kit includes everything you need to fit to the FF 500.