Caption: The Model 521 is a 5 channel hand-held ozonometer for measuring total ozone column per standard WMO configuration easily, accurately and dependably. Credit: Solar Light Company, LLC Related Press Releases Solar Light Company, Inc. Announces Updated Microtops II Ozonometer Link to this document Email & IM: Direct Link: HTML Code: IMG Code: Download Document Please contact the Solar Light Company, LLC for information on redistribution requirements. Download Document Information Headline: Model 521 Microtops II Ozonometer Source: Solar Light Company, LLC Release date: Thursday Mar 15, 2018 Release time: 09:03 am City:: Glenside State:: PA Size:: 605 KB Share