• Vertex Power: Range +20diopterto-20dioper
  Step 　0.12D
• Prismatic Power: Range 5 prism diopter
  Step 1 diopter
• Cylindnical Axis: Range 0 to 180 degrees
  Step 1 degrees
• Lenses Accommodated: Diameter 20mm to 85mm
• Eyepiece Focusing: -5D to +5D
• Bulb: 220V/15W 110V/15W