Abstract: An improved skin test kit comprising base well means and a plurality of injection units held in recessed depressions of the base and removable therefrom is provided with vent means for permitting gas escape during insertion of the injection units. The injection units comprise a hilt portion which may be mated with the periphery of the well depression. A vent hole communicating with a portion of the depression can vent gas through the base bottom, thereby preventing excessive pressure in the well means. The injection unit includes a hollow cannula within a hollow handle with a sharp point extending into liquid test substance in its respective well. Each cannula can be loaded with a predetermined amount of liquid by capillary action and the vent means prevents overloading and provides a controlled amount of liquid to be held in the cannula elements.