Objektiv Plan-Apochromat, incl. 100 cover glasses bleifrei, 20x/0,8 wd=0,17mm

This refers to the magnification factor of a single microscope lens. A lens with the number 40 is referred to as a scale of 1:40 or simply a factor of 40 times. If you multiply the lens factor by the eyepiece factor, you get the magnification.

Specifies how much larger an object appears compared to when viewed with the naked eye.

Here you will find microscopes that are suitable for a variety of classroom settings.