Intellitouch PT40 Rechargeable Tuner by Intellitouch. $34.81. The 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&#x27;s vibration instead of using sound. Works on electric and acoustic guitars, basses, violins, banjos, mandolins and more. A US...