Water hardness is caused almost entirely by calcium and magnesium ions
Hardness increases soap consumption
Hardness test kits include the inexpensive Models 5-B and 5-EP

Technical Details

Size (LWH): 5.1 inches, 2.7 inches, 2.7 inches
Product Details
Product Dimensions: 5.1 x 2.7 x 2.7 inches
Shipping Weight: 0.65 pounds (View shipping rates and policies)
ASIN : B008FM7WLU