EBay Multitests Listing is for (1) : Multitest Multitest Aquarium Test Kits. Choose from 5 different Test Kits ( each kit will do 75 tests ) COPPER This kit measures copper (all types) to less than 0.01 Mg/L in marine or freshwater. Uses a highly sensitive catalysis based procedure. MultiTest™ Copper performs over 75 tests and contains a reference sample for validation. IODINE/IODIDE This kit measures iodine or iodide to less than 0.005 Mg/L. MultiTest™Iodine/Iodide performs over 75 tests and contains a reference sample for validation. MARINE pH & ALKALINITY This test kit features a unique dye that has a pronounced color change between 8.0 And 8.3, Making it the easiest kit on the market to read in that critical range. Alkalinity may be read from the same sample in 0.5 Meq/L increments. MultiTest™ Marine pH & Alkalinity performs over 75 tests and contains a reference sample for validation. NITRITE/NITRATE This kit measures nitrite to less than 0.1 Mg/L and nitrate to less than 0.2 Mg/L in marine or freshwater. MultiTest™ Nitrite. Nitrate performs over 75 tests and contains a reference sample for validation. PHOSPHATE This kit 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. MultiTest™ Phosphate performs over 75 tests and contains a reference sample for validation. Silicate Measures silicates to less than 0.5 Mg/L Multi-cavity plate for simultaneous testing of up to 6 tests at the same time Includes reference for test validation Marine and freshwater Natural sea water contains about 10 mg/L as silicate. In reef or other marine aquaria, silicate should be 1 mg/L or less. Silicate is non-toxic to fish and invertebrates, but is ideally kept below 1 mg/L to minimize diatomaceous algae. In freshwater, silicate is not critical. Usually, freshwater silicate concentrations will range in the area of 4–20 mg/L. MultiTest™ Silicate measures silicates to less than 0.5 Mg/L in marine or freshwater. This kit measures soluble silicate and reports it as silicate concentration. To convert to silicon, multiply by 0.3. It performs over 75 tests and contains a reference sample for validation. Please feel free to contact me for International and combined auction shipping rates or with any questions or concerns that you may have about my products. Thank you!