ATI ICP-OES Complete Saltwater Water Test Kit Includes a Prepaid Label to Ship your Water in Includes Salinity and KH unlike competing test kits Major elements: chloride, sodium, sulphur, magnesium, calcium, potassium, bromine, strontium and boron Minor elements: aluminium, antimony, arsenic, barium, beryllium, bismuth, cadmium, chromium, cobalt, copper, iron, iodine, lead, lithium, manganese, mercury, molybdenum, nickel, phosphorus, selenium, silicon, silver, thallium, tin, titanium, vanadium and zinc