This head-form is based on a medium sized head. It has a stainless- steel ISO 16900-5 trachea, to attach to a breathing machine, (such as the i-bodi DBM). The front of the face has a 30 Shore Hardness elastomer face skin, (different Shore Hardness can be provided), to provide a less resistant locus point for a respirator. The head has the facility to add a sampling port in the right eye. The under-skull is made from a cast aluminium filled resin, providing some thermal mass, and the whole system is mounted on a robust stainless-steel base.