... Arc-shaped stand,compensation free head Specially for lab use Binocular Biological Microscopes XSP-136EAchromatic objective: 4X,10X,40X ( spring ), ... Wide field eyepieces WF10X,(WF16X optional)Viewing head:Compensation free binocular head Nosepiece: Quadruple Stage:Double layer mechanical stage,size:120x125mm ... or 110V,DC ouput 6V Arc-shaped Stand,New Products:Binocular Biological Microscopes XSP-136E