The Master Key Chromatic Pitch Instrument A-440 by Wm. Kratt Co is a versatile tool for musicians within the range of A-440. With 18 keys, this pitch instrument allows for precise tuning and calibration in a variety of musical contexts. Designed by the reputable brand Kratt, this chromatic pitch instrument is a reliable accessory for achieving accurate and consistent pitch levels during performances. Perfect for guitarists, vocalists, and instrumentalists looking to fine-tune their instruments to the standard pitch of A-440.