Optical system:Limited achromatic optical systemObservation tubes:Binocular head,inclined 30 degrees and rotatinginterpupillary distance:54-75mm ,5 degrees diopter controleyepiece:PL10X/18mm, High eyepoint ,widefield plan eyepieceplan achromatic objective: 4X,10X,20X,40XS,100XConverter: internal positioning 4-hole converterFocusing adjustment:Coaxial coarse and fine focusing adjustment,with limited and tension adjustment,coarse adjustment range: 25mm,fine adjustment precision:0.002mmStage:llow position coaxial mechanical stage,size: 150x142mm, travel range 76x50mm ,with two sets clipsCondenser:N.A.1.25 Abbe condenser with iris diaphragmlluminator:3W LED lighting, preset center, brightness continuously adjustable;