The BEI Sensors/Sensata part 01102-022 is an incremental hollow shaft encoder with a 3.5" diameter. This encoder is designed to provide reliable and precise position feedback for a wide range of applications. It features a hollow shaft, allowing for easy integration into existing systems. With its incremental output and high resolution, this encoder ensures accurate measurements and smooth operation. It is a durable and versatile solution for various industrial and commercial needs.