45mm din achromatic objective： 4x， 10x， 40x (s)， 100x (s, oil), wide field plane-scope eyepiece： wf10x， f16x； total magnification： 40x-1600x, sliding binocular head， interpupillary distance：55-75mm； 45º inclined， 360º rotatable double layers mechanical stage： 140x155mm, moving range x-y： 70x50mm, Ø2-Ø30mm iris diaphragm and Ø32 filter； abbe condenser： n. a. 1.25, coaxial coarse and fine focusing adjustable mechanism：25mm， precision： 0.002mm, built-in adjustable brightness halogen lamp 6v /20w.