Can anyone help. All our soldering irons are fitted with tip extraction, the system is tested annually, but at each iron they only do a smoke test. Operatives are now complaining extraction is not sufficient. Does anyone know of any legal extraction levels which must be present at the tip & what equipment would we need to carryout this test. At this point I don't want to enage with our LEV test company as the system was only tested around November & was sufficient. (checked tubes are clean) Any help much appreciated. Neil