... ,compensation free head Specially for lab use Binocular Biological Microscopes XSP-136EAchromatic objective: 4X,10X,40X ( spring ),100X( spring,oil )Eyepiece: ... Wide field eyepieces WF10X,(WF16X optional)Viewing head:Compensation free binocular head Nosepiece ... 110V,DC ouput 6V Arc-shaped Stand,New Products:Binocular Biological Microscopes XSP-136E