Reagent refill for Red Sea Pro Test Kits. Sizes Alkalinity - 75 tests Calcium - 75 tests Iron - 50 tests Iodine - 50 tests Magnesium - 75 tests Nitrate - 100 tests Phosphate - 100 tests Potassium - 50 tests .rTable { display: table; width: 100%;} .rTableRow { display: table-row; } .rTableHeading { background-color: #ddd; display: table-header-group; } .rTableCell, .rTableHead { display: table-cell; padding: 3px 10px; border: 1px solid #999999; } .rTableHeading { display: table-header-group; background-color: #ddd; font-weight: bold; } .rTableFoot { display: table-footer-group; font-weight: bold; background-color: #ddd; } .rTableBody { display: table-row-group; }