English translation: sorting out the fruit by size
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Explanation: Actually, more context would be helpful. The caliber of a fruit could refer to its "quality" in size, its "quality" in taste or variety, or the measurement guage (size) represented by the instrument used to measure diameter or circumference of an object called a "caliper." It could also refer to the length or width of a given fruit. As I said, more context would help to narrow the possible choices.
Good Luck and let me know if you have more context available.