Embodiments of the invention are directed to a skin testing-device system. The system includes a tray, a well holder that snaps into the tray and that holds a plurality of rows of test-solution wells, and a well holder-assembly lid that snaps into the tray over the well holder. The well-holder may include see-through windows such that a test-solution level is visible for substantially each of the test-solution wells from one or more single viewpoints, which may be elevated, and offset, from the well holder. The well holder-assembly lid may include areas that prevent skin-test devices in the test-solution wells from being dislodged from the test-solution wells while the well holder-assembly lid is snapped into the tray. Embodiments of the invention are directed to a clamshell-package system for holding skin-test devices. The system includes a clamshell package having generally crescent-shaped receptacles in an offset pattern and a clamshell-package lid.