A tiny, free and unusual program for tuning the guitar. Just connect the guitar to the microphone input of the sound card. In the system mixer you have to select the microphone recording source and set the volume to maximum (in the guitar as well).

Then in the tuner, select the string from the menu or using the mouse scroll. The program also allows automatic recognition of the tuned string, but the author recommends using this function if the guitar is tuned. The adjustment is made in such a way that the pointer is in the middle.

The tuner allows tuning in basic tone with an accuracy of 0.5 Hz.