Ozone test kit

“Lovibond” Water Testing  “Tintometer” Group

The Lovibond ” CHECKIT” comparator is a compact, lightweight colorimetric unit suitable for both mobile and static water analysis. Available with a number of different colour scales it provides the basis for a comprehensive easy-to-use analysis system.
Each “CHECKIT” Comparator Disc contains a continuous colour scale for exact colour matching between standard and sample.

http://www.lovibondwater.com/product/checkit-comparator-kit-ozone.aspx