This is hands down my favorite clip-on tuner. It is the easiest to use and it is so responsive.
The clip-on tuner works when you place it on the instrument and play a string. The clip-on tuner reads the vibration, so you could be in a very loud room and the tuner would still work!
The clip-on tuner has a chromatic setting, this is my favorite one for tuning all types of string instruments in all tuning options.