The HI3812 is a chemical test kit that measures total hardness as CaCO3 by titration with EDTA. The HI3812 is supplied complete with all of the reagents and equipment necessary to perform approximately 100 tests. The HI3812 is a titration-based chemical test kit that determines the total hardness concentration in two ranges: 0.0 to 30.0 mg/L and 0 to 300 mg/L.

•  All reagents marked with expiration date and lot number for traceability
•  Manual titration performed with calmagite indicator
•  Pre-made reagents for ease of use

Features at-a-glance
Complete setup
•  All required materials are included with the test kit, such as the sample beaker, plastic pipette, and reagent dropper bottles.

  High resolution
•  Readings from 0.0 to 30.0 mg/L are determined to 0.3 mg/L resolution.
•  Readings from 0 to 300 mg/L are determined to 3 mg/L resolution.

  Replacement reagents available
•  There is no need to buy a new kit when reagents are exhausted. The HI3812-100 can be ordered to replace the reagents supplied with the kit.

  Significance of Use
•  Water hardness has traditionally been defined as the capacity of water to precipitate soap. The ionic species in the water causing the precipitation was later found to be primarily calcium and magnesium.
Thus, water hardness is actually a quantitative measure of these ions in the water. It is also now known that certain other ion species, such as iron, zinc, and manganese contribute to the overall water hardness.
The measure and subsequent control of water hardness is essential to prevent scaling and clogging in water pipes.


  Range : 0.0 to 30.0 mg/L CaCO₃; 0 to 300 mg/L CaCO₃
  Resolution : 0.3 mg/L (0.0 to 30.0 mg/L range); 3 mg/L (0 to 300 mg/L range)
  Method : EDTA
  Number of Tests: 100
  CTK Type : Titration
  Weight : 460 g
  Ordering Information : HI3812 test kit comes with 30 mL hardness buffer, 10 mL calmagite indicator, 120 mL EDTA solution, 20 mL plastic beaker with cap, 50 mL plastic beaker with cap, and 1 mL syringe with tip.