This European Standard specifies a method for combustion engine driven pedestrian controlled and hand-held machines with or without back pack power unit used in agriculture, forestry and gardening to determine those parts of the surfaces identified by the product specific standards that are hot surfaces and can be touched unintentionally by an operator during normal operation. This European Standard is only applicable together with product specific standards for the categories of machines specified above. This European Standard does not specify which surfaces shall be assessed.