The D'Addario Planet Waves NS Micro Tuner PW-CT-12 offers improved accuracy, faster response, expanded calibration range, visual metronome mode and an improved ratchet design. A highly sensitive piezo transducer and easy-to-read multi-color backlit display allow smooth and highly accurate tuning in noisy, dim or well-lit environments. The micro design and reversible screen allow the tuner to hide effortlessly behind or mount on the front side of the headstock. This allows the tuner to remain clamped to the instrument inside most cases when stored. A 360 degree swivel mechanism and adjustable padded clamp offer optimal viewing angles and maximum positioning flexibility. As a result, the NS Micro tuner is equally at home on left- and right-handed instruments as well as on small and large headstocks, making it the ideal choice for the widest variety of players and instruments. The NS Micro headstock tuner is powered by a readily available CR2032 battery (included). The tuner’s auto-off function provides maximum battery life by shutting the tuner off automatically after several minutes of nonuse. Enjoy effortless and inconspicuous tuning at a great value with the NS Micro headstock tuner. A Ned Steinberger design.