Need your wallet, keys, phone, lipstick, gum, second tube of lipstick, and snacks (you never know) before you go out with the girls but can't close your clutch? (makeoverly.com)
To use the Duo as a single electric pump, simply remove the second set of tubing and use the port cover to close the second tubing connection. (motifmedical.com)
While the foil rolls through the first tube, it heats up to a certain ideal temperature, at which point it is ready to roll through the second tube, where the scientists pump in a specified ratio of methane and hydrogen gas, which are deposited onto the heated foil to produce graphene. (sciencedaily.com)