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Trust the original Hach test kit!
Simple drop-count titration measures hardness as grains per gallon CaCO₃ (1 gpg = 17.1 mg/L). Utilizes drop count titration with a range of 1-30 gpg.
Contains approximately 100 tests.
Hach has a complete portfolio of instruments and chemistries with support and services to help you get the right results.