objective CCIS, UC PL Ph, 100X / 1.25, wd 0.16 mm, infinity, PL, Ph, oil, S

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.

Describes the optical design of the lens.