Magnesium HR Checker

•  0.00 to 2.00 ppm range
•  Ideal for wastewater

The HI-719 pocket checker is a simple and accurate way to measure magnesium hardness.

The HI-719 uses an adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th edition, EDTA colorimetric method. The reaction between magnesium and reagents causes a reddish violet tint in the sample.

Key features

• Accurate and easy to use
• ±0.20 ppm ±5% of reading
• 0.01 ppm resolution
• Designed to work with Hanna reagents
• Large easy to read digits
• Auto shut-off

Ideal for

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

Supplied with

• 2 sample cuvettes with caps
• Reagents for 25 tests (re-ordering information HI-719-25 x 25 tests)
• Syringe with tip
• Plastic beaker
• 1 x 1.5V AAA battery
• Instructions

Also available: Calibration set HI-719-11.

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 HI-719-25 Reagents with Hi-719 Magnesium Hardness Handheld Colorimeter - Checker®HC - 25 tests.

Use HI-719-11 Calibration Check Set with Hi-719 Magnesium Hardness Handheld Colorimeter - Checker®HC.

Range		0.00 to 2.0 ppm
Resolution		0.01
Accuracy @ 25°C		±5% of reading ±0.20ppm
Light source		LED @ 525 nm
Light Detector		Silicon photocell
Method		Adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th edition, EDTA colorimetric method. The reaction between magnesium and reagents causes a reddish-violet tint in the sample.
Environment		0 to 50°C; RH max 95% non-condensing
Battery Type		(1) 1.5V AAA
Auto-off		After ten minutes of non-use
Dimensions		86.0mm x 61.0mm x 37.5mm
Weight		64g
Ordering Information		HI-719 Checker® is supplied with (2) sample cuvettes with caps, reagent starter kit x 25 tests (re-ordering HI-719-25 x 25 tests), 1 x 1.5 AAA battery, instructions.

HI719-11 Details:

The Magnesium Hardness Checker® HC Calibration Check Set – HI-719-11 provides a simple solution to validating the Magnesium Hardness Checker® HC – HI-719. This high-quality set of standards is supplied with a Certificate of Analysis. 

HI-719-11 is a high-quality set of calibration standards that allows users to validate the Magnesium Hardness Checker®HC – HI-719. The HI-719-11 includes one sealed cuvette for zero ppm CaCO₃ and one cuvette that is tinted to an equivalent 1.00 ± 0.20 ppm CaCO₃sample @ 25°C. The calibration check set is produced using reagent grade chemicals in a temperature controlled environment.

HI719-25 Details:

The HI-719-25 are high-quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their Magnesium Hardness Checker® HC. These reagents follow the EDTA colorimetric method in which the reaction between magnesium and the reagent causes a violet tint in the sample. When the HI-719-25 reagents are added to the sample, the reaction will take place and the HI-719 will determine the concentration from the colour that is produced. The results will be displayed in ppm of magnesium hardness as CaCO₃. These reagents are designed to be used with samples that have an expected range of 0.00 to 2.00 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.