The New Intellitouch PT40 Rechargeable Tuner
Combines vibration-based tuning with a Lithium Ion rechargeable battery! It is automatic, chromatic, and displays the measured pitch on a large, backlit display for easy tuning.
The PT40 tuner ignores background noise - it feels the instrument's vibration instead of using sound. Works on electric and acoustic guitars, basses, violins, banjos, mandolins and more.
Additional features include simple one-button operation, A-reference range of 430Hz to 450Hz, backlit display that turns from red to green when in-tune, and auto-shut off.