To measure the 'spot concentrations' of diesel fuel. Uses include determination and measurement of concentration peaks, personal exposure in the inhalation area, detection of leaks in pipelines or gas installations and air analysis in sewers, shafts and confined spaces.

Cross sensitivity: Various organic compounds with changing sensitivity are displayed. Reaction principle: Undecane + I₂O5 = I₂

One stroke is equivalent to a volume of 100 ±5 ml of gas passing through the tube.