Professional Chromatic tuner with Tone generator. Tune Guitar, Piano, Violin with a iTuner app. - High Accuracy ( > 0.01 semitone) - Tuning forks (20 - 20 000 Hz) - Frequency meter - Spectrum FFT - Use for Voice training Tuning systems: - Equal temperament (1, 2​¹⁄¹², 2​²⁄¹², 2​³⁄¹², 2​⁴⁄¹², 2​⁵⁄¹², 2​⁶⁄¹², 2​⁷⁄¹², 2​⁸⁄¹², 2​⁹⁄¹², 2​¹⁰⁄¹², 2​¹¹⁄¹², 2) - Pythagorean (1, ²⁵⁶⁄₂₄₃, ⁹⁄₈, ³²⁄₂₇, ⁸¹⁄₆₄, ⁴⁄₃, ¹⁰²⁴⁄₇₂₉, ³⁄₂, ¹²⁸⁄₈₁, ²⁷⁄₁₆, ¹⁶⁄₉, ²⁴³⁄₁₂₈, 2) - 12 equal parts (1, ¹³⁄₁₂, ⁷⁄₆, ⁵⁄₄, ⁴⁄₃, ¹⁷⁄₁₂, ³⁄₂, ¹⁹⁄₁₂, ⁵⁄₃, ²¹⁄₁₂, ¹¹⁄₆, ²³⁄₁₂, 2) Tuning frequency: - Adjustable. Default 440 hz Waveforms: - Sine - Triangle - Sawtooth - Square Guitar Tuning - recommended press all next strings Piano Tuning - for octaves 0,1,2 need use external mic. Unlock octaves: Your subscription will renew automatically each year and payment will be charged to your iTunes Account within 24-hours prior to the end of the current period. You can turn off auto-renewal by going to your Account Settings after purchase. Terms of Use: http://gv-apps.com/iTunerTermsOfUse.html Privacy Policy: http://gv-apps.com/appsPrivacyPolicy.html