Use the SwabCheck sterile cellulose swabs to quickly and easily check for the presence of bacteria on a surface. Simply wipe a surface with a swab, insert the swab into a tube containing a special medium with an indicator dye for a specific microorganism, then incubate. The super-sensitive SwabCheck medium changes color even when only a single bacterium is present. The quicker the color change happens, the higher the number of bacteria that are present. No color change after the maximum incubation period indicates the absence of the corresponding microorganism.

The Listeria isolation SwabCheck swabs help detect the presence of Listeria on foods and in the environment. A color change from light brown to black/dark brown indicates bacterial contamination; faster the change, higher the concentration. Each self-standing, round-bottomed plastic vial contains media with a cotton swab secured inside the screw cap. Store vials in temperatures between 2 and 8°C (35.6 and 46.4°F).