Red Sea’s user-friendly, and lower cost, MCP Nitrite/Nitrate Marine Test Kit. This combined test kit provides either 100 nitrite or 50 nitrate plus 50 nitrite advanced colorimetric tests for marine aquariums. This kit is essential during the maturation of all marine and reef aquariums and is suitable for ongoing algae management with Red Sea’s NO 3 : PO 4 -X in fish-only systems. Nitrate / Nitrite Marine Test Kit Specifications: Test Name Accuracy Range Test Type No. of test NO 2 0.05 ppm 0-1 ppm Colorimetric 50 NO 3 2 ppm 0-250 ppm Colorimetric 50