HI 38079 Magnesium Test Kit for Irrigation Water Product Description: By using the HI 38079 HANNA test kit, it is possible to differentiate between calcium and magnesium, since the kit determines only the magnesium ions. The HANNA test kit determines magnesium in irrigation water via a titrimetric method. Calcium, if present, is removed by prior filtration. Then the indicator chelates ... Read More »