The HI96719 is no longer available.
Below is the link to a new meter that has been upgraded with many advanced features including an improved optical system, dot matrix LCD that offers a graphical tutorial mode to help the user through the measurement process and is waterproof including the cuvette assembly.
Both meters use the same reagents.

The HI96719 portable photometer is for the measurement of magnesium hardness. Hanna’s portable photometers feature an advanced optical system; the combination of a special tungsten lamp, a narrow band interference filter, and silicon photodetector ensure accurate photometric readings every time. The Hanna exclusive CAL Check™ feature utilizes ready-made, NIST traceable standards to verify both meter validation and calibration. The exclusive cuvette locking system ensures that the cuvette is inserted into the measurement cell in the same position every time to maintain a consistent path length.

The HI96719-11 CAL Check™ standards are used for calibration and performance verification of photometers with the CAL Check™ function.

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