I've got a chromatic tuner (have to, for the autoharps), it does pretty well with the lower strings, especially using an orchestra tuning pickup. And I fiddled with the string for a while afterward; it just didn't sound good tuned to D or to E.

That's always the first string that sounds terrible on this guitar in any case, when the strings start to get old. There's no help for it but to restring the guitar.