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Total Hardness Chemical Test Kit - HI3812

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.

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


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. The HI3812 is supplied with all of the necessary reagents and equipment to perform the analysis. The test kit contains enough reagents for perform approximately 100 tests.

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.

Additional information

Weight 0.43 kg



SKU HI3812
Name Total Hardness Chemical Test Kit – HI3812
Hardness, Total Measurement Type titration
Hardness, Total Range 0.0 to 30.0 mg/L CaCO₃; 0 to 300 mg/L CaCO₃
Hardness, Total Resolution 0.3 mg/L (0.0 to 30.0 mg/L range); 3 mg/L (0 to 300 mg/L range)
Hardness, Total Method EDTA
Hardness, Total Number of Tests 100
Weight 460 g (1 lb.)
Dimensions 200x120x60 mm (7.9×4.7×2.4 in.)

Ordering Info

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.


Total Hardness Chemical Test Kit – HI3812