Used for measuring nitrate concentration in water samples, this assay kit is ideal for environmental monitoring, particularly in assessing drinking water, surface water, and wastewater quality. It enables quick and accurate detection of nitrate levels within the 0.1–10.0 mg/L range, making it suitable for regulatory compliance testing and agricultural runoff studies. The kit is commonly used in laboratories, field testing, and research settings where precise nutrient analysis is required. Its colorimetric method allows for easy reading with a spectrophotometer or visual comparison, supporting efficient decision-making in water treatment and pollution control.