Specifications Sphere:  0.0 to -29.50 Diopters, step:  0.25,0.50,1,3            0.00 to +26.75 Diopters,step:  0.25,0.50,1,3 Cylinder:  0.0 to ± 8.75 Diopters,step:0.25 Prism form:  Base up,base down,base in,base out Binocular balance:  Rotary prism,polarizing filter and R & G filter Cross cylinder:  ±0.25D ,±0.37D ,±0.50D PD:  48 to 80mm in 0.5mm step Retinoscope:  +2.00D or+1.50 both sides Corneal alignment: 12 to 20mm by 2mm step and 13.75mm Field of view:  35° Power source: AC110-120V/220-240V,50/60Hz,90VA Dimension:455×282×140mm

 Net weight:7.0Kg

 Battery case weight:5.0kg

Power supply:AC 100-120V or 220-240V 50/60Hz

Horsepower:90W

 Package dimensions:590×470×470mm

Gross weight:15kg

Integrated automatic refractometer