"Hach"

Designed for testing ammonia in freshwater or seawater, this kit's color disc method offers low-cost, fast, reliable results in an easy-to-carry kit.

Simple, low-cost color disc method is the most accurate visual test kit method

Model HA-4P MG-L is a hardness, total and calcium (magnesium by difference) drop count titration/EDTA test kit with a range of 20-400 mg/L

Water hardness is caused almost entirely by calcium and magnesium ions. Other di- and trivalent metals have a similar effect, but usually are not present in high enough concentration in potable waters to cause problems. Hardness increases soap consumption in laundries and causes scale in boilers.