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 low force probe module is identified by a green cap. This probe module is designed for applications that require a low trigger force to measure workpiece deflection. The recommended stylus limits for the low force probe module are:•Steel and carbide styli up to 30 mm long•No star or cranked styli