Assertion: eyepiece's inch | /r/HasProperty | 30 mm
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Source sentences:
text: Generally, microscope eyepieces are 0.9 inches (23 mm) or 1.18 inches (30 mm) in diameter, while those in telescopes may be 0.96 inches (24.5 mm), 1.25 inches (31.75 mm) or 2 inches (50.8 mm) in diameter.