Feature: 1. HIGH EFFICIENCY: Achromatic objective lens coating treatment, with high transmittance and refractive index, the image is brighter and clearer. 2. 10X HIGH POWER: The microscope objective lens has high power 10X magnification, the numerical value is accurate, and the operation is convenient. 3. SPRING DEVICE: With spring protection device, the cover glass can be automatically rebounded when it is observed to avoid crushing the specimen. 4. DURABLE MATERIALS: The objective lens is made of excellent brass, and the shell is chrome plated, with fine workmanship, corrosion and drop resistant. 5. STANDARD SIZE: The screw interface is 20.2mm, which is the international standard RMS size, and the connection is tight and not easy to fall off. Specification: Item Type: Objective Lens Model: 10/0.25 Material: Brass Use: Microscope accessories Interface Size: Approx. 20.2mm / 0.8in (international standard RMS size) Numerical Aperture: 0.25mm Cover Glass Applicable Thickness: 0.17mm Microscope Applicable Mechanical Tube Length: Approx. 160mm / 6.3in Working Distance: Approx. 7mm / 0.3in Common Rail Distance: Approx. 195mm / 7.7in Parfocal Distance: Approx. 45mm / 1.8in. Package List: 1 x Objective Lens1 x Storage Box