Welcome to our store! STANDARD THREAD: 4X achromatic objective lens, standard RMS size thread interface, suitable for most professional biological microscopes on the market. METAL MATERIAL: The objective lens is made of brass and stainless steel, chrome plating, corrosion and drop resistance, and has a longer service life. AUTOMATIC REBOUNDING: With a spring protection device, automatic rebound upon contact with the coverslip during observation to prevent the sample from being crushed. COATING FILM LENS: This achromatic objective lens uses a high-transmittance film lens, which has a high refractive index to ensure a brighter image. REPLACEMENT PART: The objective lens has a compact size, making it easy to install on the microscope and can directly replace old or damaged ones. Item Type: Objective Lens Material: Brass, stainless steel Use: International standard RMS size thread interface, suitable for most professional biological microscopes on the market Specification: 4X Package List: 1 x Objective Lens 1 x Storage Cylinder Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.