Features [Easy to use] The length of this achromatic objective lens is 31.3mm, easy to use [High practicality] This achromatic objective can eliminate unnecessary reflections and increase contrast [Clear image] This achromatic objective lens can provide high-quality observation without other chromatic aberration, making the image clearer [High-quality material] This achromatic objective lens adopts a precision-processed aluminum alloy casing, which is stable and durable. [Scope of application] This achromatic objective is a 10 times achromatic objective for biological microscopes Features: 1. Aluminum Alloy shell is precision machined, stable and durable for long time use. 2. This is a 10X achromatic objective lens for biological microscope. 3. It can eliminate unwanted reflections and increase contrast. 4. Offers high quality observation without additional chromatic aberration, make image more clear. 5. The Length of the objective lens is 31.3mm, easy to use. Specification: Item Type: Achromatic Objectives Lens Material: Aluminum Alloy + Optical Lens Color: As Pictures Show Magnification: 10X Tube Length: 160mm / 6.3inch Conjugate Distance: 185 Cover-glass Thickness: 0.17mm   Objective Lens Length: 31.3mm Mounting Size: 20mm（Standard RMS Thread) Item Size: 5 * 5 * 5cm / 2.0 * 2.0 * 2.0inch Package Weight: Approx. 55g Package List: 1 * Achromatic Objectives Lens Package List