NYOS REEFER test kits - taking measurements at the laboratory level at an attractive price Water properties as close to nature are the key for every aquarium #39;s success. However, monitoring relevant parameters in seawater is difficult due to numerous interfering ions. Therefore, test kits considering the specific characteristics of seawater are needed to analyse the water precisely. High sensitivity seawater phosphate test kit highly sensitive reagents professionally calibrated colour chart differentiated colour gradations precise sliding comparator sample tubes made of glass Technical Details Number of Tests:50 Measurement Range: 0.0251.0 mg/l PO