Brooke Walsh measures the ozone layer using world standard Dobson
instrument number 83. The calibration of most ozone instruments made from the
Earth and from space are traceable to Dobson 83.
Image ID: wea03466, NOAA's National Weather Service (NWS) Collection Location: Hawaii, Mauna Loa Photo Date: 2005 July 7 Photographer: Forrest M. Mims III
