Surprising exactly

Surprising exactly

Tetra Test GH 723 542 (total hardness), water test for freshwater aquariums, reliably and accurately measures the total hardness, 10 ml (Misc.)
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Customer Review

Beware of red-green weakness, because it is better if someone helps.
One has the choice between single and double accuracy.

The measurement is very accurate. (Measured cold water, hot water for heat exchangers, Brita filtered water).

The color changes to quickly. For the price a great purchase!

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