Control Systems 21 has a reputation for excellent service. We provide support and service for legacy components and systems as well as early computer systems. We also provide design, installation and commissioning services for state-of-the-art Automation Systems and Communications. Control Systems 21 specializes in the service, calibration, design and installation of process control instrumentation. From precision industrial manufacturing to modern municipal water and waste water treatment, our manageable size and no-nonsense style of business will optimize your automation and control system budget dollars. Looking for replacement parts, but don't know where to go? We carry most manufacturers' consumables such as thermocouples, RTD's, sensors, probes, charts, pens and ribbons.