Description: Features: This device is suitable for spectacles measurement detection departments, spectacles processing factories, spectacle sales departments, department of ophthalmology in hospitals and optical element factories to assay spherical lens diopter of ophthalmic lens or lens cylindrical lens, diopter, astigmatism axis of cylindrical lens, diopter of prism. Specification: Vertex Power Range: +15 diopter to -15 diopter; Vertex Power Step:0-(±)10D for 0.125D (±)10D-(±)15D for 0.25D; Prismatic Power Range: 4 prism diopter; Prismatic Power Step:1diopter; Cylindrical Axis Range: 0 to180 degrees; Cylindrical Axis Step: 5 degree; Lenses Accommodated: Diameter 20mm to 80mm; Eyepiece Focusing:-5D to +5D; Power supply: DC4.2V 2W (2AA batteries) Package Included: 1 x Lensometer 1 x Operation Manual 1 x Suitcase 1 x Charger
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