There is provided a housing for a dispenser suitable for dispensing medicament, particularly for use in the treatment of respiratory disorders. The housing comprises a body; said body including a support for receipt of said aerosol container; a first outlet port connectable to a first pressure recorder for recording change of pressure on firing of said aerosol container; and a second outlet port connectable to a second pressure recorder for recording air pressure within the body; wherein said first outlet port and said second outlet port are separate such that the change of pressure on firing and the air pressure within the body are individually recordable.