Nutrafin Carbonate and Total Hardness Aquarium Test Kit
Hardness Test Kit manual
http://www.hagen.com/pdf/aquatic/nf-General_Hardness.pdfNote: do not forward this to anyone in the public, FOR CS REP USE ONLYPrinter diversity of color rendition makes it impossible for a normal printer or monitor to faithfully reproduce the colors on the chart for accurate comparison.
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