Feature: 1. HIGH PERFORMANCE: The objective lens has coating treatment, with high light transmittance and refractive index, and the image is brighter and clearer. 2. SPRING DEVICE: With spring protection device, the cover glass can be automatically rebounded when it is observed to avoid crushing the specimen. 3. DURABLE MATERIAL: Made of excellent brass material, and the shell is chrome plated treatment, with fine workmanship, corrosion and drop resistant. 4. STANDARD INTERFACE: Adopt international standard RMS size 20.2mm screw interface, which can be used by most professional biological microscopes. 5. 100X MAGNIFICATION: The microscope objective lens has high power 100X magnification, the numerical value is accurate, and the operation is convenient. Specification: Item Type: Objective Lens Model: 100/1.25 Material: Brass Use: Microscope accessories Interface Size: Approx. 20.2mm / 0.8in (international standard RMS size) Magnification: 100X Numerical Aperture: 1.25mm Cover Glass Applicable Thickness: 0.17mm Microscope Applicable Mechanical Tube Length: Approx. 160mm / 6.3in Working Distance: 0.13mm Impregnation Medium: Cedar Oil Spring: Yes (automatic rebound) Common Rail Distance: Approx. 195mm / 7.7in Parfocal Distance: Approx. 45mm / 1.8in. Package List: 1 x Objective Lens1 x Storage Box