tested and working although tuning a guitar is beyond my ability
VTG 6 pc Bamboo Master made wooden dizi, concert master flute, Irish flute like
Seiko ST606 Guitar Bass Tuner Vintage Japan with Rare SONY Astro Boy Battery
Vintage SEIKO ST606 QUARTZ GUITAR AND BASS TUNER.
Vintage Seiko Professional Digital Metronome DM-10 (b2)
SEIKO DM51 Clip-on Digital Metronome Easy Volume Control with Clock Function
Vintage SEIKO Metronome Model PN802
