The Yokogawa DM1B-075G is a High-Resolution, Incremental Hollow Shaft Encoder from Yokogawa's "Flexcoder" series.
This model is a robust and cost-effective sensor designed for measuring speed and relative position in industrial automation applications. Its defining feature is the large hollow shaft (through-bore) design. This allows for easy and direct mounting over the shaft of a motor or other rotating equipment, simplifying alignment and eliminating the need for flexible couplings.