Boss have taken their best selling tuner and improved it. It is housed in an extremely tough casing, which will take all kinds of gigging punishment. You can choose from either guitar or bass tuning modes which include up to 6-string bass and 7-string guitar tuning respectively.
It has 21 LED lights with brightness control, so you can tune in any light. Flat tuning is supported with Guitar Flat mode, which allows for “drop” tunings up to six semitones below standard pitch