How does the Sutro Monitor connect to the Sutro Hub? December 07, 2022 19:44 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 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? What happens during calibration? What chemical parameters does Sutro test for?