The Fluval A7835 is an aquarium water test that tests the level of the following in your aquarium water:
The Fresh & Saltwater Iron Test- 50 tests 0.0-1.0 ppm helps you maintain the suggested healthy iron level in your aquarium water, which is 0.25 to 0.5 milligrams/Liter (mg/L). This water iron test is essential to maintaining proper water quality in your tank. This aquarium iron test includes 50 tests.
The Fluval A7835 specifications: