The West Instruments 3500 PID Process Temperature Controller PCB ASSY. 459/01 is a digital unit designed for process temperature control in industrial automation systems. Made in the United States by West Instruments, this controller is a reliable and high-quality component for maintaining precise temperatures in various applications. With its model number 3500, this PCB assembly is a crucial part of PLCs and HMIs used for motion control and automation purposes. This unit is a single quantity product that offers stability and accuracy in controlling temperature processes.