... 2.professional quality CE 3.favorable price, fast delivery digital optometry phoropter, auto phoropter #ZD3000: Specification:Sphere: 0.0 to - ... .2,0.25,0.5,1,3Cylinder: 0.0 to ± 8.75 Diopters, step:0.25,0.5,1,3Cylinder Axis ... ×140mm, 7.0Kg We have CE and ISO for this digital optometry phoropter. Please contact us if you are interested. We ...