You'd buy 3 if you were operating 3 scopes at once. And you might not operate 3 scopes at once (and many wouldn't), but 2 at once is definitely not rare.
With integration, in this case, the dew heater system, the idea is that you're not told to buy a particular heater - you don't have to buy anything because the feature of dew heating is integrated into the scope itself.
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