Magnesium Hardness Checker® HC - HI719

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The Hanna Checker® bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits are not very accurate and only give 5 to 10 points resolution while professional instrumentation can cost hundreds of dollars and can be time-consuming to calibrate and maintain. The Checker® is both accurate and affordable. *Note: This checker is not suitable for use with saltwater (marine) aquariums.


The HI719 Checker®HC (Handheld Colorimeter) is a simple, accurate, and cost effective way to measure magnesium hardness. Designed as a more accurate alternative to chemical test kits, the HI719 provides quick, accurate results in four easy steps: 





Hardness, Magnesium   



0.00 to 2.00 ppm 


0.01 ppm 


±5% of reading ± 0.20 ppm 


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. 

Additional Specifications 


Battery Type    

use 1.5V AAA / 10,000 hours of continuous 


0 to 50°C (32 to 122°F); RH max 95% non-condensing 


after ten minutes of non-use   

Photometer/Colorimeter Light Source 

LED @ 525 nm 

Photometer/Colorimeter Light Detector 

silicon photocell 


86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5”) 


64 g (2.3 oz) 

Ordering information 

HI719 Checker®HC is supplied with 2 cuvettes and caps, reagent starter kit (50 packets of reagent), 1 X 1.5X AAA battery, and an instruction manual.