i very good purchase for a casual player.

Great purchase, I have recommended it to others.

You won't regret this purchase

In other words, no B, C, D, F, E sharp, Open A, Open C, Open D, Open F, Cross Note C, Cross Note D, anything that requires you tune a string to C or F.To put a simply, no experimenting, which is pretty much the only reason I can think of to buy a tuner.