Freedom Scientific RUBY+ - Control Buttons; Button Functions Explained

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Button Descriptions
Power: Press to power on. Press it again to power off.
Color Mode: Press to cycle through Normal (color), Black on
White, White on Black, Yellow on Blue, and Yellow on Black color
modes.
Magnification: Press to cycle through three different magnification
levels. Magnification varies depending on how far you hold RUBY+
from an object.
Freeze Frame: Press to freeze the current image. Press again to
turn off Freeze Frame mode and return to live view.