Calling all science enthusiasts and lab pros! This AmScope 4X Infinity Plan Achromatic microscope objective is exactly what you need to upgrade your microscope game without breaking the bank. It's brand new and works with most compound biological microscopes that follow the international DIN/JIS standard (which is pretty much all the common ones out there). The 4X magnification power with that 0.1 numerical aperture and infinity/0.17 specs means you're getting super clear, sharp images without any of that annoying color distortion. What's really cool about this one is it's a 'plan' lens - which is science talk for giving you flat field views across the entire image, not just the center. No more blurry edges! If you're building your microscope collection, they've also got 10X, 40X and 100X options to complete your set. Perfect for students, hobbyists, or anyone working in labs who needs reliable equipment. The build quality is solid and it snaps right into place on compatible microscopes. Seriously, if your current lenses are letting you down or you just want to expand your magnification options, this is totally worth it. Way better performance than you'd expect for the price!