These brand new microscope Plan Achromatic objective set comes with 4X, 10X, 40X &100X Plan Achromatic objectives, fitting common size (DIN standard) compound microscopes. Plan Achromatic Objective 4X (NA 0.10, Infinity-corrected, 17mm cover). Plan Achromatic Objective 10X (NA 0.25, Infinity-corrected, 17mm cover).Plan Achromatic Objective 40X (NA 0.65, Infinity-corrected, 17mm cover). Plan Achromatic Objective 100X (NA 1.25, Infinity-corrected, 17mm cover). This is a set of Infinity-corrected Plan Achromatic objective lenses, fitting common-size (DIN standard) compound / biological microscopes. It comes with 4X, 10X, 40X & 100X Plan Achromatic objective lenses. 4X, 10X, 40X, 100X Plan achromat objective lenses. Plan flat-field corrections for a flat, well-focused field of view. Cover Glass Thickness: 0.17mm. We offer 30 days from the date of receipt (verified by tracking information) to request a return on a unit. We appreciate your patience and understand everyone has a critical need for their unit, and do everything we can to ensure that these requests are handled as quickly as possible. Include your order number, reason for return, and if any pictures are required for your claim, please include them also. Follow the issued instructions, and once received, we will process the item in, and check to ensure everything is there. Processing is done first come, first serve, and can take between 1-4 weeks to process (depending on how many requests we currently have in queue). We thank you for your patience while we work on your request. This item is in the category "Business & Industrial\Healthcare, Lab & Dental\Medical/Lab Equipment Attachments & Accessories\Microscope Parts & Accessories\Microscope Objectives". The seller is "amscope" and is located in this country: US. This item can be shipped worldwide.