Notes and Octaves
Tuned jews harps - number of different models in stock
Jews harp considered as "Tuned" if its frequency match known note (keys) frequency with +/- 10 cents precision (as A=440Hz as standard)
Sound pitch and notes in stock
Frequency range shown on chart is not a single exemplar's range property but is statistical deviance of base frequency between different exemplars. Big range says that there are chances to fin one low, on high instrument for example; narrow range means that any exemplas will have the same base frequency.