An open socket, into which a module can be inserted, may include: a body into which the module is insertable; a pin to contact an electrical connection member of the inserted module, the pin serving as at least a part of an electrical signal path to/from the module upon insertion thereof; an elastic biasing member to exert an elastic biasing force to cause the pin to contact the module; and at least one lower support to limit insertion depth as being a depth at which a lower portion of the inserted module comes to rest upon the at least one lower support; the body and the at least one lower support being constructed and arranged to provide a gap adjacent the at least one support, which leaves an area of the socket underlying the lower portion of the inserted module open to the outside.