Abstract <p>An automatic frequency tuning system has been developed and implemented for probes used in nuclear magnetic resonance (NMR) and quadrupole resonance (NQR) spectroscopy. It is based on available technologies that allow for assembling this system for any probe, regardless of the control method. The control electrical part is implemented on the Arduino platform and includes platform-compatible modules: stepper motors and a servo. The equipment for placing the control system was manufactured using additive technologies, which simplified the process of prototyping and assembly a ready-made system. Due to the availability and low cost of the components, the automatic tuning system can be adapted and configured for any NMR-probes. This auto tune system made it possible to avoid manual adjustment of the probe during the experiment and reduce the time spent.</p>