The image shows a set of tools used for measuring thickness, specifically designed for measuring fish scales. The tools include:

1. **Thickness measurement driver**: This is a specialized tool used to measure the thickness of fish scales. It consists of a handle with a curved grip and a small round gauge at the end.

2. **Fish scale sample**: A piece of fish scale is placed on the table next to the tools, indicating that this tool is intended for use with fish scales.

3. **Instructions or notes**: There are printed instructions or notes on the table, which likely provide guidance on how to use the tools effectively.

4. **Background elements**: The background includes a red cloth or fabric, which could be part of the display or setup for the measurement tools.

The image appears to be related to a demonstration or educational setting, possibly for teaching or research purposes. The tools and instructions suggest that they are used in the field of fish biology or ichthyology, where understanding fish scales