Brewer provides near simultaneous observations of the total ozone column, SO2, and UV spectra.
MkIII Brewer Recommendation by Environment Canada
Environment Canada (EC) recommends the Mark III Brewer Ozone Spectrophotometer as significantly superior to the MkII and MkIV Brewers for the measurement of solar radiation and Ozone in the Ultraviolet (UV) region of the spectrum. This is because of the much improved stray light performance of the double-monochromator optical system used in the MkIII compared to the single-monochromator of the MkII and MkIV.
For this reason Kipp & Zonen no longer produces the MkII and MkIV models and for a number of years has only manufactured the MkIII Brewer. Of course spares, service and factory support continue to be available for all models of Brewer.
Brewer MkIII makes automated observations of the total Ozone column and SO2 and provides high quality UV spectra.