1,binocular eyepieces 2, very light in LED lamp, 3, 10x.16x available, 4, ... -70mmWorking distance: 78mmSlit width: 0mm~ 10mm(continuously adjustable)Slit height0.2, 0.3, 5,10mmFilter: Hear absorption, Redfree, Cobalt blueIllumination rotator ... -3000 OTHER DESIGN PORTABLE SLIT LAMP Portable Slit lamp microscope LYL-S/SL3000