Structural Monitoring Systems Plc is a holding company. The Company is engaged in the development and commercialization of its intellectual property for products used in testing and monitoring the structural integrity of materials that are subject to operational stress and fatigue in structures, such as aircraft, ships, transportation infrastructure and power plants. Its Comparative Vacuum Monitoring (CVM) is a measure of the differential pressure between fine galleries containing a low vacuum alternating with galleries at atmosphere in a simple manifold. The CVM system consists of a sensor that is applied to the area requiring testing or inspection; a vacuum source to control and apply a partial vacuum to the sensor; a differential pressure flow meter device with output options that interface with the control systems, and software management systems that process the data. The CVM technology has been developed for use in both a laboratory environment or on operating equipment.