Red sea iodine pro test kit contains 50 testselement iodineaccuracy 001ppmtest type colorimetricnumber of tests 50all pro test kits come in a durable plastic housing and use optically clear analytical lab grade glass test vialsused for the testing ofiodine in the aquariumcan also be used as part of the stage 2 algae nutrient control in the red sea reef care program the algae nutrient control stage provides a complete solution for testing and controlling nuisance algae and promote cora