Based on this product's specifications, here are some alternatives and similar models
Video viewfinder mbg line DD2 LCD 2.8-inch portable field monitor
Summary description:
The mbg line DD2 is a 2.8-inch LCD video viewfinder designed for on-camera and field use. It provides a compact monitor for framing, focusing and reviewing footage from compatible camera outputs. Lightweight and portable, the DD2 is suited for run-and-gun shooting, camera rig setups and monitoring in tight spaces, offering clear image preview and easier composition on set.