60 tests- Accurate test with easy to read color scale. Detects 0.1 to 0.3 ppm of phosphate in marine and freshwater aquariums. Test weekly.
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 -