The MCR20 module changing rack is designed to securely store up to six TP20 probe modules for automatic changing, and to protect them from airborne contaminants. The MCR20 is easily mounted onto any CMM. Setting the MCR20 rack alignment and probe module changing co-ordinates requires minimal effort. The standard force probe module is identified by a black cap. This probe module is suited to the majority of applications requiring extensions up to 50 mm long. The recommended stylus limits for the standard force probe module are:•Straight styli up to 50 mm long•Star and cranked styli up to 20 mm offset The medium force probe module is identified by a grey cap. This probe module is designed for applications where a higher trigger force than standard is required. The recommended stylus limits for the medium force probe module are:•Any stylus type up to 60 mm long•Star and cranked styli up to 20 mm offset