harmonica tuning / szájharmonika hangolás
Tune a harmonica using your ears and a simple chromatic tuner: http://harp.andrewzajac.ca/tune
The French Tuner: Tune a harmonica easily. https://www.youtube.com/watch?time_continue=12&v=2TxTb1MZrdI
Lee Oskar Maintenance http://leeoskar.com/documentation/Lee-Oskar-The-Art-of-Harmonica-Maintenance.pdf