Bass guitar tuner behringer tu300 buy bass guitar tuner chromatic tu300 from behringer an essential piece of equipment for the electric guitarist and bassist featuring an adjustable reference tone of between 438 nbsp and nbsp 447hz capable of meeting the needs of standard tuning and also flat and double flat tuning for both guitar and bass the tuner also has a chromatic mode to give seven modes of operation br br the tu300 is footswitch operated and when stepped upon the blue