Binary package “fmit” in ubuntu focal

Free Music Instrument Tuner

 FMIT is a graphical utility for tuning your musical instruments, with
 error and volume history and advanced features like microtonal tuning,
 statistics, and various views like waveform shape, harmonics ratios and
 real-time Discrete Fourier Transform (DFT). All views and advanced features
 are optional so that the interface can also be very simple.