Nutrafin’s Iron Test (0.0 - 1.0 mg/L) measures iron levels in fresh and saltwater aquariums. Iron must be carefully monitored and kept at a level that supports and maintains lush, planted aquariums. It is recommended to test iron with a frequency that will maintain the suggested iron level of 0.25 to 0.5 mg/L. The kit provides up to 50 tests and includes: - One 7.5 mL (0.2 fl oz) bottle of Iron reagent # 1 - One 5 g (0.1 oz) bottle of Iron reagent #2 - One glass test tube with cap - One pipette - One lab base - One instruction booklet