The Ultramatic RX Master™ Phoroptor® – the first and always the best refracting instrument - continues to be the industry standard after nearly 80 years. Every Phoroptor® has that unmistakable feel of quality. The smooth rotation of the dials. The virtual absence of play in the mechanisms. The precise, solid click of the control knobs. Constant reminders that you’re using the world’s finest refracting instrument. It’s a fit and feel no one can duplicate, any more than they can duplicate the Phoroptor®'s optical quality, accuracy and reliability. The legendary smoothness and positive detents provide constant reminders that you are using the world's finest refracting instrument. Hundreds of thousands of phoroptors in daily use, and millions of completed refractions, are a testament to the Phoroptor's enduring value. The Reichert Phoroptor is the only refracting instrument that carries a limited lifetime warranty--your assurance of lasting quality. The Ultramatic Phoroptor® offers world-renowned mechanical quality. Lens position and power verified by an auto-indexing, PC-based lensmeter Precision geared rotary prism for more precise interpolation of small prism diopters Corrosion-resistant materials No plastic internal components Heavy-duty precision materials Legendary feel – smoothness and positive detents that made the Phoroptor® famous Included Accessories: ± .25 Flip cross cylinder + 1.50 Retinoscopic Lenses Accessory Case 3 pair nylon face shields Rotochart™ Reading rod with card holder Specifications Range Steps, Scale Graduations Additional Information Sphere -19.00D to + 16.75D 0.25D + 0.12D Sphere in auxiliary dial included Cylinder Power 0.00D to 6.00D 0.25D Plus or minus lens system optional 0.12D and 2.00D in accessory cells included Cylinder Axis° 360° (Double 0°-180° scale) 5   Cross Cylinder ± 0.25 — ± 0.37 or ± 0.05 Optional Prism 0Δ to 20Δ 1Δ — P.D. 48mm to 75mm 1mm — Vertex Distance 13.75mm (normal) — Graduations extend range by 6 mm Reading Distance 5" to 28" — Centimeter and diopter scales included Auxiliary Dial 10 lenses plus 2 open apertures — —