Calcium Hardness Checker

•  0.00 to 2.70ppm
•  Calcium

A simple, accurate and cost effective way to measure low ranges of calcium in water.

Designed as a more accurate alternative to chemical test kits, the HI-720 provides quick, accurate results in four easy steps.

HI-720 uses an adaptation of the standard methods for the Examination of Water and Wastewater, 18th edition, Calmagite method. The reaction between calcium and the reagents cause a reddish-violet tint in the sample.

Ideal for

• Water purification systems
• Heating and cooling systems
• Drinking water
• Wastewater
• Plating

Key features

• Small palm-sized design
• Accurate from ± 0.20 ppm ±5% of reading
• Dedicated to a single parameter
• Auto power off after 10 minutes of inactivity
• Built-in timer for timed reaction readings

Order Information

The HI-720 Calcium Hardness Checker is supplied with sample cuvettes with caps (2), calcium hardness reagent starter kit x 25 (re-ordering information HI-720-25 x 25 tests), syringes with tips (2), plastic beaker, battery, instructions and quick start guide.

Also available: Calibration set HI-720-11.

Four steps. One click. Instant Readout.

  1. ‘Zero’ the Checker®HC with your vial & water sample inside

  2. Take the vial out and add your reagent

  3. Place your vial into your Checker®HC

  4. Press the button and read the results

Use reagents HI-720-25 for HI-720 Calcium Hardness Handheld Colorimeter -Checker®HC x 25 tests

Use Calibration Set HI-720-11 for HI-720 Calcium Hardness Colorimeter - Checker®HC

HI720-11 Details:

The Calcium Hardness Checker® HC Calibration Check Set – HI-720-11 provides a simple solution to validating the Calcium Hardness Checker® HC – HI-720. This high-quality set of standards is supplied with a Certificate of Analysis. 

HI-720-11 is a high-quality set of calibration standards that allows users to validate the Calcium Hardness Checker® HC – HI-720. The HI-720-11 includes one sealed cuvette for zero ppm CaCO₃ and one cuvette that is tinted to an equivalent 1.50 ± 0.25 ppm CaCO₃ sample @ 25°C. The calibration check set is produced using reagent grade chemicals in a temperature controlled environment.

HI720-25 Details:

These reagents follow the Calmagite method in which the reaction between calcium and the reagent causes a violet tint in the sample.

The HI-720-25 are high-quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their Calcium Hardness Checker® HC. These reagents follow the Calmagite method in which the reaction between calcium and the reagent causes a violet tint in the sample. When the HI-720-25 reagents are added to the sample, the reaction will take place and the HI-720 will determine the concentration from the colour that is produced. The results will be displayed in ppm of calcium hardness as CaCO₃. These reagents are designed to be used with samples that have an expected range of 0.00 to 2.70 ppm CaCO₃.

Tip for an accurate measurement

It is important that the sample does not contain any debris.

Whenever the cuvette is placed into the measurement cell, it must be dry outside and completely free of fingerprints, oil or dirt. Wipe it thoroughly with HI-731318 or a lint-free cloth prior to insertion.

Shaking the cuvette can generate bubbles, causing higher readings. To obtain accurate measurements, remove such bubbles by swirling or by gently tapping the cuvette.

Do not let the reacted sample stand for too long after reagent is added, or accuracy will be lost.

After the reading, it is important to discard the sample immediately, otherwise the glass might become permanently stained.