How much clearance should be left around the Smartscan Hydra Head? Technical Support February 24, 2019 08:18 Related articles How deep does a nib or pillar need to be for it to become a preferred installation position? How do you specify Smartscan Hydra? What do I do if Smartscan Hydra is beeping? What height are the Smartscan Hydra heads mounted? Comments 0 comments Please sign in to leave a comment.