What size is Smartscan Hydra head & face plate? Egli November 04, 2019 22:08 Updated Dimensions for the Smartscan Hydra face plate: 129 x 124 mm Dimensions for the Smartscan Hydra head: 96 x 86 mm Related articles Where has Automist been installed? Could you please confirm which conventional Apollo multi-sensor is compatible? How much does Automist cost? What are the obligation of every Accredited Installer? How much does the annual maintenance cost? Comments 0 comments Please sign in to leave a comment.