1. STANDARD RMS THREAD: The thread interface of this achromatic objective lens is an international standard RMS size, which can be used by most professional biological microscopes on the market. 2. SPRING PROTECITON: The objective is equipped with a spring protection device, which can automatically resilient when in contact with the cover glass during observation, protecting the lens from damaging the specimen. 3. RELIABLE MATERIAL: The microscope objective is made of brass and stainless steel, with chrome plated on the outer shell, corrosion prevention and fall resistant, ensuring service life. 4. CLAER IMAGING: The lens of the achromatic objective lens are coated with high transmittance, with high refractive index and brighter imaging. 5. NO COLOR DIFFERENCE: An achromatic objective can eliminate unwanted reflections and increase contrast, providing perfect observation without additional color difference, making the image clearer.