I tune my 12-string D-G-C-F-A-D. . Will this tuner do that?
With the Chromatic setting it will work with any tuning.
Will this tuner work to tune a 6 string electric lap steel guitar?
The tuner should work fine on the lap steel guitar
Does anyone know if this will tune a 12 string electric?
Yes it will tune a 12 string guitar when you use the Chromatic mode.
What the battery life? And what kind?
The included CR2032 battery life is ment to reach 1 year if kept in temperatures 22℃-27℃. This could be longer or less depending on how often you use it.
What are the dimensions of this tuner?
Clipped on the guitar it has a depth of 2″ (tuner plus clamp). The tuner itself is 2″ high x 1.25″ wide x about 1/2″ thick.
Does this tuner work well with solid body electric guitars?
Yes this tuner works well with solid body electric guitars.
Will it tune a delcimer?
Yes, it has a setting for chromatic tuning. As long as you can clip it on.