A predated air damper is used for damping to keep the size and weight of the total package as small as possible. The recorder is reliable because of its simplicity. It does not contain any of the more complex and less reliable components, e.g., batteries, connectors, motors, and bearings. The recorder is economical in that no external connections or power are required. The record plates are reusable by replating.
Maintenance is very low since the unit can be unattended for long periods of time.
Materials have been selected for long life even when exposed to nuclear radiation. The cast housing, along with the cover and three plugs, is chemically filmed and painted with polyurethane paint. The gaskets are made of EPDM to increase resistance to radiation. All hardware is stainless steel. An indicating silica gel desiccant is also provided to decrease the humidity inside the recorder.