The TCR20 probe module changing rack is designed specifically for PH20 and features a tip correct artefact located at the centre of the rack assembly for PH20 metrology optimisation. It securely stores up to six TP20 probe modules for automatic changing and protects them from airborne contaminants. The TCR20 is easily mounted onto any CMM. Setting the TCR20 rack alignment and probe module changing co-ordinates requires minimal effort.