How many tones does a harmonica go up in?

A standard diatonic harmonica typically has 10 holes, and each hole can produce one note when blown and another when drawn, covering a range of around three octaves. The instrument is usually tuned to a specific key, allowing it to play notes within that scale. When using techniques like bending, players can access additional notes, effectively allowing the harmonica to reach tones beyond its standard range. However, the fundamental range is generally limited to the key it is tuned to.