The Mitutoyo M Plan Apo SL 50x 0.42 is a high-quality microscope objective lens with a super long working distance of 0.42mm. Made in Japan, this super long working distance lens offers a magnification of 50x, making it ideal for detailed observation and analysis in various fields such as medical, lab, and industrial applications. This unit includes one lens and is a valuable addition to microscope setups requiring precision and clarity in magnified images.