This is a genuine Breville water hardness test strip, which is the ideal choice to quickly, easily and reliably determine water hardness. It is the test strip for the determination of water hardness. Clear color changes from green to red ensure an accurate readout. Individually sealed water test strip can perfectly be combined with promotion activities to inform customers about the necessity of water softeners. Instructions for use are printed on the seal. This water hardness test number will be needed to manually entered in your selected Breville coffee machine as the water hardness affects how the coffee tastes.