Fine tuners are small mechanical devices used on string instruments, such as violins, violas, cellos, and basses, to make precise adjustments to the pitch of the strings. They are typically found on the tailpiece of the instrument, near where the strings are attached. Fine tuners allow for small, incremental changes to the pitch, helping musicians achieve a more accurate tuning.

While the main tuning of the strings is usually done using the pegs located near the scroll of the instrument, fine tuners are used for fine-tuning once the instrument is roughly in tune. This is especially helpful when the pegs have reached their limits or when a finer adjustment is needed.

Fine tuners typically consist of a small screw and a mechanism that attaches to the tailpiece. Turning the screw moves a small saddle or clamp that adjusts the tension of the string.

In Tamsta music store you can find a great choice of fine tuners for string instruments.

https://tamsta.com/lt/683-derinimo-masineles

https://www.petzkolophonium.com/shop/lng/en/accessories/finetuner/violin/