Specification Name: Holographic diffraction grating Material: Float glass Processing mode: Original inscription Grating size: 20x10mm Thickness: 2mm Specifications: 50-2400 lines/mm Wavelength range: 200nm-10000nm Application: Spectrometer spectroscopic / optical experiment teaching / precise displacement measurement / laser flashlight or other new product development Size 20x10x2mm Payment: We accept Alipay here and all major creditcards accepted by Alipay. Payment is required to be made within 6 days from the closing date of your purchased. If you don't pay in time, we can't promise we will keep the item you bid in stock all the time. Any problem with payment please contact us first. Shipping: We only ship items to your confirmed address in AliExpress (except APO/FPO), so please make sure the address is correct before purchase. Items of most orders will be shipped out within 1-3 business days upon receipt of your payment confirmation and you can receive them within 10-35 business days. Delivery depends on destination and other factors, it may take up to 35 business days or more. We are not responsible for import charges or fees. Damaged on Arrival: When you sign the parcel, please check it carefully. You'd better take a video or photos when open it. If there is any damage or shortage for your parcel, contact your Post Office or Express company immediately, Please send video or photos to our service staff at the same time. Feedback: We rely on AliExpress`s Feedback and customers` satisfaction to succeed. Therefore,your feedback is extremely important to us. Please leave 5 star in feedback to us if you are satisfied with our goods and service. We will give you best price and better service when you make an order next time. We will leave back the same feedback to you after receiving your feedback. Please email us before leaving any negative feedback or opening any dispute on AliExpress. We will help you to resolve the problem. Please give us the opportunity to resolve any problem.We understand the unhappiness you might have if the order go wrong,but we will try our best to give you the satisfying results. We care about our regular customers, and we will always be trying to help you. Hope to establish long business with you... You can contact me if you have any questions. Our Business Hours: 8:30A.M.-6:00P.M. Mon-Fri 8:30A.M. -12:00 P.M. Sat

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