Hardly a day goes by anymore without hearing about a cybersecurity event in the news. In this paper/session, we will analyze the risk associated with smart devices, calibration, and maintenance that could compromise the cybersecurity status of operations and possibly our entire companies. As a nuclear power plant operator and electronic technician, we never considered the security risk of having an instrument calibrated by a third party. Today, however, things have changed significantly and it is common to find microprocessors in virtually everything including the instruments we are using in our plants. The microprocessor has made significant impacts on performance and communications and consequently might be weakening your organization’s security. The analysis presented will discuss the real risk associated with different types of instrumentation and devices, network topologies, and technologies used in smart devices and systems. Additionally, we will analyze the possible effects on safety systems and how to compensate for them and how to protect your systems.