While the 3-component core is generic, the surface deployments tend to use the 4" housing (which is easy to build) while the underwater deployments (about half of the current fleet)  use the 2" body style. Usually those deployments are too deep to record with our little point & shoot camera, but we recently did an install in a coastal outflow that was shallow enough to capture a clip of the method we use to hold the sensors in place. In this video we are placing the anchor in the fresh water, with extension rods to move the actual sensor into the zone where saline water (the silty brown layer) in intruding into the system. All the elements of the system are made from zip ties & cheap plumbing parts.