Application Total Hardness Test Kit
 The total hardness test kit determines the hardness of water in degrees of German hardness. Each drop added corresponds to a degree of German hardness.
 
 1st step
 While the water is red, add the liquid drop by drop into the measuring cup. Count each drop and shake the measuring cup lightly after adding each drop.
 
 2nd stage
 As soon as the water turns slightly yellow, carefully add an additional drop or two.
 
 3rd step
 When the liquid turns green, you have determined the hardness of the water from the amount of drops added.
 
 Water hardness converter
 fH°: degree of French hardness  /   e°: Clark degree (English hardness)
 dH° 
 [5]
 [10]
 [15]
 [20]
 [25]
 [30]
 [35]
 [40]
 [45]
 [50]
 fH° 
 [9]
 [18]
 [27]
 [36]
 [45]
 [53]
 [62]
 [71]
 [80]
 [89]
 th
 [6]
 [13]
 [19]
 [26]
 [31]
 [38]
 [44]
 [50]
 [56]
 [63]
 rounded numbers
 
 Exact conversion from dH° to fH°
 fH° = dH° * 1.78
 
 Exact conversion from dH° to e°
 e° = dH° * 1.25