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 LensModel: 10/0.25Material: BrassUse: Microscope accessoriesInterface Size: Approx. 20.2mm / 0.8in (international standard RMS size)Numerical Aperture: 0.25mmCover Glass Applicable Thickness: 0.17mmMicroscope Applicable Mechanical Tube Length: Approx. 160mm / 6.3inWorking Distance: Approx. 7mm / 0.3inCommon Rail Distance: Approx. 195mm / 7.7inParfocal Distance: Approx. 45mm / 1.8in.Package List:1 x Objective Lens1 x Storage Box