Features: 1. Aluminum alloy shell is precision machined for stable and durable long-term use. 2. This is a 40X achromatic objective lens for biological microscopes. 3. Helps reduce unwanted reflections and improves contrast. 4. Provides high-quality observation with minimal chromatic aberration for clearer images. 5. Objective lens length is 37.8mm, designed for easy installation and use. Specification: Item Type: Achromatic Objectives Lens Material: Aluminum Alloy + Optical Lens Color: As shown in pictures Magnification: 40X Tube Length: 160mm / 6.3inch Conjugate Distance: 185mm Cover-glass Thickness: 0.17mm Objective Lens Length: 37.8mm Mounting Size: 20mm (Standard RMS Thread) Item Size: 5 x 5 x 5cm / 2.0 x 2.0 x 2.0inch Package Weight: Approx. 62g Package List: 1 x Achromatic Objectives Lens Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-GONGQ trading 3