The Snark ST-8HZ Super Tight H.Z. Clip On Guitar Tuner is a highly accurate, quick, and easy to use guitar tuner that conveniently clips on to the headstock of your guitar, with a 360 degree adjustable display that is bright and easy to read. The pitch calibration feature allows tuning anywhere from 415 - 466 Hz (440 Hz by default). The transpose features allows you to check whether you are in tune when using a capo on the first four frets, set the tuner to the fret the capo is on and it will still read the open note if you are in tune, allowing you to quickly check you are in tune without having to think of the relative fretted note. The Super Tight H.Z. is Snark's most accurate tuner and has a hertz option for tuning accuracy of 1/10 of 1 Hz on guitar and 4 or 5 string bass, the standard tuning function is chromatic and so will tune 7 and 8 string guitars.