Diagnostic and Service Units (DSU) are specialized equipment used in industrial maintenance and repair, often associated with brands like Radwell International, a US-based company. These units are designed for diagnosing, testing, and servicing industrial machinery, including PLCs, drives, and control systems. DSUs cater to industries such as manufacturing, automation, and energy, providing tools for troubleshooting and preventive maintenance. Products may include testers, calibrators, and diagnostic software, ensuring efficient operation of complex systems.