The BEI Sensors/Sensata part 01070-881 is an incremental hollow shaft encoder with a 3.5 diameter. It is a high-quality and efficient device that offers precise and accurate position sensing. The hollow shaft design allows for easy installation, making it suitable for various applications where space is limited. With the Express-H35 technology, this encoder ensures reliable and fast performance. It is a dependable and cost-effective choice for various industries such as robotics, automation, and industrial control systems.