ALGAE CONTROL PRO MULTI TEST KIT High accuracy colorimetric comparator tests for the exceptionally high accuracy measurement of Nitrate and Phosphate. For all Reef Systems. NO3 | PO4 Red Sea’s Algae Control Pro Multi Test Kit includes high accuracy colorimetric comparator tests for the exceptionally high accuracy measurement of nitrate and phosphate. The nitrate & phosphate tests are essential for the accurate dosing of Red Sea’s NO 3 : PO 4 – X (biological nitrate & phosphate reducer) which is part of the complete Red Sea Reef Care Algae Management Program. Test Name Element Accuracy Range Test Type No. of test Nitrate Pro NO 3 0.125 ppm 0-64 ppm Comparator 100 Phosphate Pro PO 4 0.02 ppm 0-5 ppm Comparator 100