Red Sea Fish Pharm ARE21515 Saltwater Reef Color Pro Multi Test Kit for Aquarium Reef colors pro test kit includes advanced tests for the high resolution measurement of iodine, potassium and iron All of these elements are associated with many biological functions, one of which being coral pigmentation This test kit enables accurate dosing of 3 of the reef colors supplements range The kit also a durable, chemical resistant plastic case and analytical grade glass vials Kit includes 50-iodine pro tests with 0.01 ppm, 40-potassium pro tests with +/-12 ppm and 50-iron pro tests with 0.05 ppm