Iodine is present in natural sea water and this iodine occurs as several different species including iodide and iodate and molecular iodine and hypoiodite. Test kits which are not capable of detecting iodate are not suitable for aquarium use and since in a properly functioning tank most of the iodide will be transferred to iodate and any test kits not able to detect iodate will give a false and low iodine reading. Iodine test kits should be capable of measuring all forms of naturally occurring iodine. Our AQUASOL AE406 – IODINE TEST KIT Iodine is the only one offering this feature and measuring all naturally occurring iodine compounds and giving a reading of total iodine concentration.