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INS-11051 Lens Stress Tester 29-B OPTI+ Dimensions: 7 x 5 x 8 in / 18 x 13 x 20 cm Weight: 1lb / 0.46 kgMaterials: stainless steelType: Clinical Examination AidsPower: 15WElectric Voltage: 220V/50Hz/110V/60Hz