Based on the skills of our adept professionals and skilled workers, we are presenting a commendable range of VT-8 Comprehensive Refractometer. It is an automated refractor which is precisely designed and has been tested on parameters of quality and durability. Also, it features great power saving function and easy operation. In addition, this VT-8 Comprehensive Refractometer is available in several specifications to meet the specific need of patrons. :: Technical Parameter :: 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） NW: About 5 KG View Tester VT-8 (Manual)