电子校音器 /调音扳手

Korg Chromatic Tuner (CA-1)
Korg Contact Microphone (CM-200)
Korg Chromatic Orchestra Tuner (OT-120)

Standard 短调音扳手, $16 (USD)
Ergonomic 长调音扳手 (舒适护手), $48 (USD)