Technical parameters Observation tube:Compensation binocular tube with 30°inclined interpupilary distance 48-76mm Eyepiece:WF 10X/20mm WF 16X/15mm 195 plan achromatic objective:PLAN 4X/PLAN 10X/PLAN 40X(spring)/PLAN 100X(spring.oil) Nosepiece:Quarruble nosepiece Focusing system:Coaxial coarse and fine focusing.Elasticity adjustable,coarse focusing range 20mm,fine focusing graduation:0.001mm Stage:Double-laver mechanical stage 160mmX142mm movinarange:76mX52mm with double slide clips Condenser :Abbe condenser N A=1.25.lift up and down,with iris diaphragm..center adjustable Power supply Extemal switch Power supply.Input AC 100-240V