A decade resistance box with adjustable range from 0 Ω to 99.9 MΩ in 1 digit increments.

The internal wiring is fairly compact, so careful soldering is recommended throughout the assembly process.

Regarding resistor accuracy: This design recommends 1% tolerance resistors, providing a good balance between cost and precision. While 5% resistors are cheaper and more common, they would noticeably reduce accuracy, whereas higher-precision resistors increase the overall cost significantly.

You will need:

8x Thumb wheel Switch KM2 0-9 Digital: https://s.click.aliexpress.com/e/_c4pyLA8p (it has a pack of 10 or 20 units). Make sure you buy them as decimal and not the BCD version.

2x Banana Socket Female Jack 4mm: https://s.click.aliexpress.com/e/_c4XtwUXJ