The kit uses two liquid reagents that react with a water sample to produce a color change corresponding to nitrate concentration. A glass test tube with a snap-tight cap holds the sample during testing, while two laminated color cards, one calibrated for freshwater and one for saltwater, are used to match the resulting hue to a specific ppm reading. The kit is packaged with child-resistant bottle caps and includes a printed instruction booklet that explains how to run the test and interpret the results. To test, a small water sample is placed in the tube, both reagents are added in sequence with shaking and a short wait period, and the color is then compared against the appropriate chart. The kit supports routine monitoring of nitrate, a compound produced when a tank's biological filter breaks down ammonia and nitrite, so levels can be tracked before they contribute to poor water quality or excess algae growth. No additional equipment is required beyond a small water sample.