A device is disclosed for the storage and testing of laboratory samples. The device includes a base plate having an aperture therethrough and having a recess extending into its bottom surface. A first raised wall member extends outwardly from the upper surface of the base plate to define a sample storage area over the aperture. A top cover is configured to fit over the upper surface of the base plate and includes a raised portion which extends into the raised wall portion on the base plate to compress the sample. A bottom cover fits snugly within the recess on the bottom surface. A sheet of testing material such as filter paper may be disposed within the recess beneath the bottom cover where it is brought in contact with the sample through the aperture in the base plate.