• Telescopes
        Up to 80mm
        --------------------------81mm - 110mm
        --------------------------111mm - 140mm
        --------------------------Larger than 140mm
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        --------------------------Larger than 8 inches
        Up to 8 inches
        --------------------------10 - 20 inches
        --------------------------Larger than 20 inches
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      --------------------------Test Category
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      --------------------------Large (51mm - 99mm)
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        --------------------------Telescope Control
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      Books and Magazines
      --------------------------Web Sites
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