The Nikon Plan Fluor 4x/0.13 PhL DL ∞/1.2 WD 16.4 Microscope Objective Lens is a high-quality microscope attachment designed for biological laboratory use. Made by Nikon in Japan, this objective lens provides a magnification of 4X, allowing for detailed observation and analysis of samples. This item is in excellent working condition with no problems that I can see.