A compound light microscope often contains four objective lenses: the scanning lens (4X), the low-power lens (10X), the high-power lens (40 X), and the oil-immersion lens (100 X). With an ocular lens that magnifies 10 times, the total magnifications possible will be 40 X with the scanning lens, 100 X with the low-power lens, 400 X with the high-power lens, and 1000 X with the oil-immersion lens. Most microscopes are parfocal.This term means that the microscope remains in focus when one switches from one objective to the next objective.Bio -microscope X170BN
45mm DIN Achromatic Objective: 4X, 10X, 40X(S), 100X(S, Oil)
Wide Field Plane-Scope Eyepiece: WF10X, WF16X;
Total Magnification: 40X-1600X
Sliding Binocular Head, Interpupillary Distance: 55-75mm; 45° Inclined, 360° Rotatable
Double Layers Mechanical Stage: 140X155mm, Moving Range X-Y: 70X50mm
Coaxial Coarse And Fine Focusing Adjustable Mechanism: 25mm, Precision: 0.002mm
Built-in Adjustable Brightness Halogen Lamp 6V/20W