One can purchase labware such as test tubes on amazon, eBay, hometraining tools. There are also local places where one can purchase labware such as Argos, and the main supermarkets may offer these.
You can purchase test tubes online from scientific supply companies like Fisher Scientific or VWR International. They are also available at many local stores like craft stores, educational supply stores, and some pharmacies.
With two test tubes you have a spare in case one of the breaks.
One can purchase vintage tubes from eBay where there are hundreds of such items available for purchase. They are also available to buy from 'Vintage Electronics'.
One can get heat exchanger tubes by contacting a company that provides this product such as Phoenix Equipment. One can also purchase online at Grainger.
One can purchase square tubes at Metals Depot, Discount Steel, Speedy Metals, All Metals Inc, Home Depot, Amazon, rsteeldepot, eBay, Yale Steel, and Grainger.
One can purchase ovulation test strips from Amazon where they are available to buy for around $20. One can also purchase them from eBay or from a local pharmacy.
Radio technology has come a long way since the days of tube radios. However, tube radio fans can purchase replacement 6L6 tubes online at thetubestore.
One could purchase a Radon Test Kit on line from Kansas State University at a discounted price. One could also purchase one at many governmental agencies in your area.
One can purchase cardboard mailing tubes at many local office supply stores, large retailers such as Wal-Mart, or at a local postal or shipping store.
According to the American Heritage Dictionary of the English Language, a test tube is a "clear, cylindrical glass tube usually open at one end and rounded at the other, used in laboratory experimentation."A test tube can be used to store chemicals that are dangerous to skin,or be connected to other lab equipment for experiments. In this case, it is usually to collect a useful product.
Here's one place where you can buy them: http://www.tubesrus.com/packaging_materials/paper-tubes/heavy-duty-mailing-tubes/default.html. They take custom orders.
Test tubes are used for holding, mixing, and heating small quantities of liquids or solids in laboratory experiments. They are also used for storing samples or conducting chemical reactions in a controlled environment. Test tubes come in various sizes and can be easily labeled for organization and identification.