| 摘要 |
A peak flow meter consists in known fashion of a housing having in it a channel along which a pointer (6) is movable to a distance dependent on the lung function of a patient using the meter. Positioned adjacent the channel are two or more indicators (12) movable along an axis parallel with the channel. Each indicator is preferably shielded from manual contact, and e.g. is movable along its path only by use of a tool. In accordance with the invention, each indicator presents to view two visually-distinguishable areas defining a boundary (24) which can be set at a point along the path of the pointer to indicate limit positions relating to lung function, so as to indicate graphically to the user when he or she might need to take remedial action.
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