สำหรับไม้บรรทัดเคลื่อนที่สำหรับกล้องจุลทรรศน์ ปรับขึ้นลง ซ้ายขวาได้ พร้อมสเกล อุปกรณ์เสริมพิเศษ ไม้บรรทัดเคลื่อนที่รุ่นใหม่

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