Sphere:0.00~-19.00 Diopters,step:0.25,0.5.1,30.00~+16.75 Diopters ,step: 0.25,0.5,1,3Cylinder:0.00~+8.75 Diopters,step:0.25.0.5.1.3Cylinder Axis:0°to 180°.step:1°.5°Prism formm: Base up, base down , base in , base outNear distance: Mechanical converging with an optical axis at 30 to 40 in fronBinocular balance: Rotary prism, polarizing filter and R & G filterCross cylinder:+0.25DPD: 50 to 80mm in 1 and 0.5mm stepRetinoscope: +2.00D or +1.50D both sidesCorneal alignment: 12 to 20mm by 2mm stepField of view 35°Power source:AC 110-120V/220-240V.50/50Hz.90VADimension:350(W)x300(H)x80(D) mmNet weight: 4kg