Those little blue potentiometers are high-precision trimmers, and their resistance can be easily set to a specific value. They are used for fine-tuning circuits and adjusting settings like voltage levels, just like how I used one in my custom breadboard power supply (video here: https://youtu.be/C_C7MWLsqdQ)
Grab a kit from here:
🟢 Amazon US: https://amzn.to/3ZEyA8v
🟢 AliExpress: https://bit.ly/4ei4zj5