This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Two Peak Flow Meters. Zwei Peak flow meter Two peak flow meters Fotografiert am Hosse Jan CET de Public Domain original upload log page de PeakFlowMeter Hosseman bytes no public domain Quelle fotografiert am Fotograf Hosseman Revision history from de Bild Peak Flow Meter Jul ForresterBot Bytes ersetze Vorlage