Red Sea nitrate pro test kit is an advanced colorimetric test with comparator, measuring the level of nitrate in your reef aquarium to an exceptionally high resolution of 0.06 ppm N-NO3. This test kit, when used in conjunction with the phosphate pro kit, enables accurate dosing of NO3:PO4-X (biological nitrate and phosphate reducer) which is part of the complete reef care program. This kit features a durable chemical resistant plastic case and analytical grade glass vials. Includes material for up to 100-tests and professional titrate.