Complete with 13 chromatic tones, the Lee Oskar Harmonicas Pitch Pipe is useful for singers and choirs (a cappella and accompanied by instruments), and for tuning guitar, ukulele, violin and other types of instruments. The pitch follows the International Standard (aâ=440Hz). The Lee Oskar Harmonicas Pitch Pipe is designed to either be held in your mouth hands-free, so that your instrument can be adjusted with both hands, or held by both hands. The Lee Oskar Harmonicas Pitch Pipe features the same exceptional quality and superior design that the global brand is known for across the entire Lee Oskar Harmonicas system, which has been manufactured in collaboration with Tombo Mfg. of Japan since 1983.