TOMBO P-13A Pitch Pipe for Japanese Instruments (A=440Hz, A=220Hz) - Brown

Should i go with this a or the e version if i want to use it to learn ear training for guitar, piano, shamisen, and voice?

Would this be alright for a collegiate mixed a capella group? The starting pitch given is usually the bass note.

Which tombo.is best for ladies barbershop quartet 13a or e?

has anyone's pipe developed problems? A few people said notes weren't in pitch. I assume they checked it with a piano and not just their "ear"