Then, in about 2 minutes I had it in perfect tune.

Don't waste your money or end up playing with a poorly tuned instrument.

..... tunes the strings, easy for child to do after showing them how, just may need to supervise so they don't over do it.....until they get the hang of it.....is good to have if serious learner

Worked fine for a month or so, but then started glitching and doesn't show the correct tune.