Permanent magnets are used in some components of the SP600 / M / Q system.  It is important to keep them away from items which may be affected by magnetic fields, e.g. data storage systems, pacemakers and watches etc.  There is no overtravel protection in the +Z axis other than an endstop.  Your control system must therefore be able to stop the motion of the machine in the +Z axis of the probe before the endstop is reached.  If this is not the case safety glasses must be worn when operating or observing the operation of the SP600M system in the case of stylus breakage.  Machine operators must be trained in the use and application of the products detailed in this guide, in the context of the machine it is fitted to, before being allowed to operate that machine.