how to scale O'Reilly books in mobi format.

Just bought the "Scratch Adventures" book. In Mobi, it was hard to read on the kindle DX. Could not scale it with the usual text scaling command.

Downloaded PDF, and it was perfectly readable even with middle aged eyes and bifocals.

What's lost ? The time downlaoding experimenting to see which format is readable on the device.

Is there a way to scale the display of O'Reilly .mobi books on Kindle DX that I'm missing ?
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