A system for inspecting signals of the circuits on a panel is disclosed. When the inner member is attached to a container under its conventional closure and the inner member and the outer member are interconnected, access to the convention closure is denied. 1 to 10% by weight, based on the total weight of the comonomers, of one or more ethylenically unsaturated comonomers containing epoxide groups, and B) one or more non-copolymerizable compounds having at least two epoxide groups.