Korg TM-50 Combination Instrument Tuner and Metronome - Black - 2-Pack Tuner and metronome can be used simultaneously or independently - See more at: http://www.korg.com/us/products/tuners/tm_50/index.php#sthash.m1LN2B1i.dpuf Newly designed highly responsive LCD needle-type meter - See more at: http://www.korg.com/us/products/tuners/tm_50/index.php#sthash.m1LN2B1i.dpuf Wide detection range from C1 to C8 Marks indicate pure major and minor third intervals - See more at: http://www.korg.com/us/products/tuners/tm_50/index.php#sthash.m1LN2B1i.dpuf A wide tempo range of 30-252 beats/minute