Based on this product's specifications, here are some alternatives and similar models
Serial Converter Repeater Isolator W&T 81009
Summary description:
The W&T 81009 is a compact RS-232 serial converter, repeater, and isolator designed for reliable data transmission. Weighing only 30 g, it ensures efficient signal integrity over long distances. Ideal for industrial applications, it provides electrical isolation to protect devices from voltage spikes, enhancing system stability and safety. Its robust design makes it suitable for various environments, ensuring durability and performance.