How does the Sutro Monitor connect to the Sutro Hub? April 30, 2020 03:43 Updated The Sutro Monitor to Hub connection is via a 900MHz connection. You can check out our FCC documentation if you want any more information > https://fccid.io/2ATKG-RAD78011. Related articles What chemical parameters does Sutro test for? Can I connect Sutro to other smart devices in my home? Is there an open API to connect with Sutro? Does Sutro work with Salt Water Systems? Can I request a chemical reading? Comments 0 comments Please sign in to leave a comment.