This is a chemical test kit that determines the phosphate concentration in three ranges: 0.00 to 1.00 mg/L, 0.0 to 5.0 mg/L, and 0 to 50 mg/L. The kit is supplied with all of the necessary reagents and equipment to perform the analysis. The test kit contains enough reagents for perform approximately 100 tests. Pre-made reagents for ease of use All reagents marked with expiration date and lot number for traceability Checker® disc for more accurate determination Readings from 0.00 to 1.00 mg/L are determined to 0.02 mg/L resolution. Readings from 0.0 to 5.0 mg/L are determined to 0.1 mg/L resolution. Readings from 0 to 50 mg/L are determined to 1.0 mg/L resolution. The HI38061-100 can be ordered to replace the reagents supplied with the kit.