The PHS-2 servo positioning head features continuous servo drive in two axes, enabling the probe configuration to be positioned at almost any angle. The PHS-2 head is driven to approximately the required position and, when a probing point is taken, the axes of the head latch simultaneously with the axes of the CMM to give accurate measurements. A range of different probes can be fitted and automatically exchanged. These include touch-trigger probes and third-party laser/optical measurement sensors. Extra-long extensions allow the Renishaw trigger probes to reach normally inaccessible features.