Peterson Autostrobe 590 Tuner

Model AS590 includes the same basic features as the AS490 Original Autostrobe, but can also function as an audio tuner by means of an Audio Out section. This feature combines input sound with reference-pitch tones into headphones or an internal speaker. Also included are automatic note tracking, headphone jack, IN speaker and output jacks, built-in metronome, and audible tuner.