Check the listing for details. Seachem MultiTest Phosphate Test Kit Freshwater & Marine Aquariums 75 Tests. Condition: New. Listed at 17.99 USD. Seachem MultiTest Phosphate Test KitMeasures inorganic phosphate to less than 0.05 mg/L.Multi-cavity plate for simultaneous testing of up to 6 tests at the same time.Includes reference for test validation.Marine or freshwater.Phosphate in natural sea water ranges from less than 0.01 mg/L to 0.3 mg/L. For corals in reef aquaria, such phosphates should be 0.2 mg/L or less. Phosphates are non-toxic to fish and most invertebrates, but are ideally kept below 1 mg/L to minimize algae growth. In freshwater, phosphates are not critical and the allowable concentration is dependent on variables such as nitrate, manganese, iron, and vitamin concentrations, as well as the extent of use of live plants.MultiTest Phosphate measures inorganic phosphate to less than 0.05 mg/L, producing a unique easy to read yellow-green-blue color range in marine and freshwater; however, usually, freshwater phosphate concentrations will be beyond the range of this kit, and dilutions of the sample with distilled water will be required. It performs over 75 tests and contains a reference sample for validation.Features:MultiTest Phosphate performs over 75 tests. And with the multi-cavity test plate, multiple tests can be run at the same time.Accuracy:Range:Measures between 0–3.0 mg/L phosphate.Precision:Detectable changes on the color chart in 0.001–0.1 mg/L increments.Reference Sample:It isn't necessary to run a reference test to use this kit; however, its proper performance can be validated by running a test in the normal manner except that the reference sample is used in place of aquarium sample. You might choose to run a reference test if you have cause to believe the test is giving incorrect results.Color Chart:All MultiTest test kits come with an easy-to-read color chart. It features a 5 cm viewing window to help isolate color and match as closely as possible to the test sample.Opaque Multi-Cavity Test Plate:All MultiTest test kits are read from an opaque white test plate. The sliding color chart along with the six-cavity test plate allows for easy reading and comparisons of several samples at the same time.MultiTest Phosphate Kit Contents:Phosphate Reagent 1Phosphate Reagent 2Phosphate ReferenceStir RodSample PipettePhosphate Color ChartMulti-Cavity Test PlateInstructions