Red Sea's 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 Red Sea's No3:Po4-X (biological nitrate & Phosphate reducer) which is part of the complete Red Sea Reef Care program. This kit features a durable chemical resistant plastic case and analytical grade glass vials. Includes materials for up to 100 tests.