"Sample vials" refers to small container-like tubes or bottles used to hold and store small quantities of substances or materials for testing or analysis purposes. Full definition
Right now, they are offering a free sample vial of Dazzle to the first 50 women that sign up for their free e-newsletter at Dazzling Bags and Rags. (thefashionablehousewife.com)
The first row of sample vials shows the initial salt solutions of the different elements. (sciencedaily.com)
Many teens were too embarrassed to spit into the sample vials. (sciencemag.org)