Bushman J A, Ali A, Perry I R, Williams G M
Br J Anaesth. 1978 Jun;50(6):551-4. doi: 10.1093/bja/50.6.551.
When tested against artificially produced peak flows, the Wright peak flow meter is found to be an accurate instrument. A factor contributing to the variation seen when the meter is in clinical use in the design of the mouthpiece. This paper reports the results obtained using a new mouthpiece designed specifically to reduce this variation.