Specification:
            (A) Measuring range:
            (1) SPH: 0.00D ~ -19.00D (-0.25D) steps
                         + 0.25D~ +16.75 D(+0.25D) steps
            (2)CYL: 0.00D ~ -6.00D (-0.25D) steps (with additional lens of -2.00D,

                        the CYL power can be up to -8.00D
            (3)AXIS: 0º - 180º
            (4)P.D: 50mm - 78mm( in 1mm steps)
            (B)Auxiliary Lenses:
            (1) Occluder
            (2) P.D Check
            (3) Pinhole Plate(1mm)
            (4) Polarizing: right eye 135º   left Eye  45º
            (5) Red/Green :Filters( right eye : red    left eye: green)
            (6) Dissolution prism: Right eye 6Δ B/U  Left eye 10Δ B/I
            (7) Maddox Rod: Right eye red horizontal/ vertical  left eye white vertical/horizontal
            (8) Fixed Cross Cylinder: ±0.50D
            (9) Retinoscope: +1.50D
            (C) Rotary Cross Cylinder lens: ±0.25D
            (D) Rotary Prism:0Δ ~ 20Δ  (1Δ steps)
            (E) Dimension & Weight:
            (1) Main body: 330(W) × 400(D) × 100(H) mm
            (2) Carton:430(W) × 530(D) × 200(H) mm
            (3) N.W: 5.1kg
            (4) G.W: 7.5kg

            REMARK: 
            (1) LED illuminated readings for sphere and cylinder powers
            (2) Dial plated with luminous effect,easy to see the readings in the dark
            (3) Horizontal level is easy to observe with built-in reflector
            (4) Power source: DC 9V(3V×3 Pieces of Battery)