This used Seiko SAT100 Tuner is in great condition and offers reliable, precise tuning for a variety of instruments. Compact and easy to use, it supports standard tuning for chromatic instruments with a wide detection range of A0 (27.5 Hz) to C8 (4186 Hz), and a reference pitch adjustable from 438 to 445 Hz. Its clear LCD display ensures excellent visibility, while the built-in mic and 1/4" input jack allow for flexible tuning options. Ideal for both student and professional musicians, the SAT100 offers accurate pitch detection and quick response in a durable, portable design with a folding stand for convenience. Operates on 2 AAA batteries (not included).