Korg TM40 Combo Chromatic Tuner & Metronome 

Revolutionary Features:
A great lesson and practice tool, the TM-40 offers both tuner and metronome functions that can be used simultaneously or independently. A large LCD-type needle delivers both the accuracy of an LCD and excellent visibility of a needle indicator. The metronome tuner also has LED indicators that show pitch deviation or blink to indicate the tempo, making the TM-40 a great visual tool.

Excellent Functionality and a Wide Detection Range:
With a detection range of C1 (32.70 Hz) - C8 (4186.01 Hz), the TM-40 provides quick and accurate coverage of a wide spectrum of notes and pitches for wind, string, keyboard and most other instruments. Even low-pitched instruments with complex overtone structures are detected with the precision you expect from KORG. A built-in high-sensitivity microphone allows acoustic instruments such as a guitar or ukulele to be tuned easily and accurately, and the separately sold CM-100L contact microphone can be used to send the vibrations directly to the metronome tuner for even greater precision.