Ophthalmic Manual Phoropter Optometry Comprehensive Refractometer View Tester VT-8 Foropter Sphere: Range:-19.00~ 16.75-1 Step:0.25-1m,3.00m-1 Cylinder: Range:0.00~-6m-1(Measuring Range with Accessories 0.00~-8.00m-1) Step :0.25m-1 Cylinder Axial: Range:0~180°Step:5° Cross Cylinder: ±0.25m-1 Rotating Prism: Range:0Δ~20ΔStep:1Δ Distance of Optical center(also known as pupil): Range:50~75mm Step:1mm Sight Switch: Range:∞~380mm(distance of Optical center is 64mm) Front Chin Test: Range:0~16mm Distance(from cornea vertex to the lens surface): 16mm Standard Accessories Lens: Two pieces of Auxiliary Cylinder -2.00m-1and-0.12m-1 respectively Standard Accessories: One piece of M2 hexagon wrench , one piece of a myopia standard card Two piece of myopia standard card, one piece of standard card holder, a dust cover Product Size: 338L×99W×292H(mm) Package size: 410L×200W×370H(mm) Net Weight: About 5kg