This Lovibond® Tintometer® Aqua Comparator is an accurate, easy-to-use test kit for water analysis. Simply add the reagent to the sample cell, rotate the comparator disc until it matches the reacted sample and read the concentration value in the comparator window. Step-by-step instructions included. Test Kit includes: Comparator, Color Disc, Sample Cells, Instructions, Reagents for 100 Tests and Carrying Case. These tests are generally simple and easy to run—the basic concept is one of adding a specific reagent which reacts with the analyte being tested to create a color. The intensity of this color is then measured. You can visually compare the intensity of the color developed against a known standard with our Aqua Comparator Test Kits. Additional reagents available separately. Chlorine / Bleach (Sodium Hypochlorite) 2 - 18% NaOCl. Tablet Reagents. Range (Accuracy ± 5% F.S.): 0 -1.8 mg/L Iron. Lovibond® Tintometer® #: 147490.