Iodine is present in NSW (Natural seawater) in a very low concentration (0.06 mg/L or 0.06 ppm).
Iodine occurs as different species. Some of them are iodide, iodate and hypoiodite.
The Salifert Iodine Profi Test measures all naturally occurring iodine species such as iodate, iodide, molecular iodine and hypoiodite. No other test kit offers this possibility.
Test kits which are not capable in detecting iodate might not really be suitable for aquarium use. Since in an aquarium iodide can be transferred to iodate. This means that if a test kit is used not capable in detecting iodate, a false low total iodine concentration (sum of iodate and iodide) will be obtained and the iodate concentration can climb far too high and possibly upsetting the aquarium environment.
*Discounts exclude products from these manufacturers with MAP (minimum advertised price) rules: Ecotech Marine, Neptune Systems (Apex), Coral Vue (Reef Octopus, Maxspect), Aqua Illumination and Aqua UV.