80 tests- Easy to read color scale. Detects 0.05 to 10 ppm of nitrite (NO2 - ion) in both marine and freshwater aquariums. Test daily in a new aquarium or when there is a suspicion of a malfunctioning biological filter
Other Items from Red Sea Test Kits Red Sea Marine Lab - Red Sea Reef Lab - Red Sea PH&Alkalinity - Red Sea Ammonia - Red Sea Nitrite - Red Sea Nitrate-ll - Red Sea Phosphate - Red Sea Calcium - Red Sea Copper - Red Sea Magnesium -