MCT-341V MANUAL REFRACTOR / REFRACTOMETER / Black or Ivy Color Do not miss this precise manual refractor at a very reasonable price. Dependable and reliable! Near rod and near card are also included. Technical Description for MCT-341V: Manual Refractor/Black or Ivy Color Sphere: -19D to +16.75D (VD-12) 0.25D steps Cylinder: 0.00 ~ -6.00D 0.25D steps, Minus cylinder only When applied with auxiliary lens -2.00D: 0.00 ~ -8.00D 0.25D steps When applied with auxiliary lens +0.12D: 0.12D steps Axis: 0 ~ 180degrees, 5 degree step Pupil distance: 50 ~ 75mm, 1mm step Cross cylinder: ±0.25D cross cylinder lens synchronized with cylinder axis Rotary prism: Range: 0~20 Δ step 1 Δ Vertex distance: 13.75mm (from corneal point to standard lens surface) Dimensions: 335 (L) x 320 (W) x 98 (H) mm