1、Aluminum Alloy shell is precision machined, stable and durable for long time use 2、This is a 4X 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 30.5mm, easy to use<br> Features:<br> 1. Aluminum Alloy shell is precision machined, stable and durable for long time use.<br> 2. This is a 4X achromatic objective lens for biological microscope.<br> 3. It can eliminate unwanted reflections and increase contrast.<br> 4. Offers high quality observation without additional chromatic aberration, make image more clear.<br> 5. The Length of the objective lens is 30.5mm, easy to use.<br> Specification:<br> Item Type: Achromatic Objectives Lens<br> Material: Aluminum Alloy + Optical Lens<br> Color: As Pictures Show<br> Magnification: 4X<br> Tube Length: 160mm / 6.3inch<br> Conjugate Distance: 185<br> Cover-glass Thickness: 0.17mm<br> Objective Lens Length: 30.5mm<br> Mounting Size: 20mm（Standard RMS Thread)<br> Item Size: 5 * 5 * 5cm / 2.0 * 2.0 * 2.0inch<br> Package Weight: Approx. 41g<br> Package List:<br> 1 * Achromatic Objectives Lens<br> 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-YJL official store