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Test kit water hardness

Icon_Made-in-Germany Goods manufactured in Germany
Examples of effect: Damage metals and burn body tissues; may cause serious eye damage. Safety: Avoid contact; wear safety spectacles and gloves. In the event of contact with eyes and skin, rinse with water.
i may be corrosive to metals, causes serious eye irritation
P280 P305+P351+P338
i wear protective gloves/eye protection, IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing
Water hardness kit
Density (D) 1,05 g/cm³
Flash point (flp) 135 °C
UN-Nr. 1719

Test reagent in dropper bottles

A 5 ml water sample is added drop by drop as a test reagent until there is a change in colour. Each drop corresponds to 1° dGH.
Product details

€32.45/Pack Qty. 

excl. VAT. | 1 unit(s) per Pack Qty.

Art. No. 0519.1

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Product details

A 5 ml water sample is added drop by drop as a test reagent until there is a change in colour. Each drop corresponds to 1° dGH.

Test kit water hardness 

Delivery incl. sample container.
Technical Information
Verification of Water hardness 
Packaging 2 x 15 ml 
Pack. 2 x 15 ml 
Test kit water hardness
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0519.1 1 unit(s) 


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Downloads / MSDS

General information

Determination of Water Hardness

Water contains a whole host of salts and other compounds in addition to the gases dissolved in it (oxygen, nitrogen, carbon dioxide). Its most important constituents are magnesium and calcium in the form of their chlorides, sulphates and bicarbonates. These dissolved salts are known as hardeners. The bicarbonates precipitate in the heat (during boiling) as carbonates and are known as carbonate hardness or temporary hardness. The sulphate and chloride compounds are known as permanent hardness or non-carbonate hardness. Total hardness describes the concentration of alkaline earth metal ions in water.

The unit of measurement for water hardness used to be 1 °dH (German degrees of hardness), which corresponds to 10,00 mg CaO or 7,19 mg MgO in one litre of water. Today we use millimoles per litre (mmol/l), whereby 1 °dH corresponds to 0,18 mmol/l of earth metal ions and 1 mmol/l corresponds to 5,6 °dH.