Spectrum Discharge Tube Air Gas Vapor Spectral Analysis Vacuum Tube This tube is designed to study spectral lines of pure elements or gases.Available in 12 different variety of element or gas such as Neon Hydrogen Mercury Argon Nitrogen Helium Water vaporOxygen Argon Sulphur Air Krypton & Carbon Di-oxide.Gas under pressure in the tubes is used to produce a light for spectral analysis.Comes with metal ends & durable electrodes.Brightness of light depends on the nature of the gas.The tubes are 26 cms in Length (Approx.) and are designed for intermittent use only. they shouldn't be used as a lamp source.Should be used on/with special power supply meant for spectrum tubes and should operate on a 30 second On & 30 second Off interval.Comes in a Plastic case.Please Note that this item is manufactured in India & will be shipped from India through Speed Post/Registered Post/TNT Express and it will take 9-11 days to reach.STORE POLICIESIMPORTANT INFORMATION ON OUR POLICY AND FEEDBACKWe try to be fair and accurate with all of our product listings and descriptions. Please read each product, buy, and sale carefully.We will appreciate it if you please email us before leaving negative feedback. If there is a problem, we can work together to resolve it. We strive to always be extremely fair and always try to work with reasonable customers.Negative feedback doesn't go away and should only be left as a last resort! We strive for positive feedback, harmonious relations and even friendships.We will always make every attempt possible to resolve issues if we made a mistake(It happens). Please do not assume a mistake is intentional.Let us know if our service could be better!!PaymentWe accept payment via PayPal secure online payment center.ShippingSmall item orders are shipped within 2-3 business days after receiving a cleared payment (Excluding Weekends)For a Larger item, orders are shipped within 7-10 business days.Items ordered together are not necessarily shipped the same day or in the same carton.NOTE: We only ship to a Physical Street Address in the 48 continental United States.International shipping, including shipping to Alaska/Hawaii/Puerto Rico, PO BOX or APO/FPO addresses, and United States territories is NOT available.Damaged ItemsIf you receive a product that is damaged in shipment please email us immediately, within2 DaysofDelivery Date. We can file a damage report with the shipping company and make arrangements to resolve the damage. Any and all damage must be documented withphotos of the damageand emailed to us within 2 days of delivery date (this is required to file a claim with the shipping company).ReturnsAll Returns must beAuthorized.Accepted AUTHORIZED returns must be received at our location within7 days of the delivery date, in NEW & UNUSED condition. The Buyer is responsible for returning the product in NEW, RESALEABLE condition. It MUST arrive UNUSED in it's original packaging, complete with ALL accessories & user manuals, warranty documentation etc. If ANY original parts, accessories, documentation, packaging etc are used, damaged or missing a 50% re-stocking fee will be charged.