API Pond Master Test Kit It is not possible to know the condition of pond water without testing it. Regular water testing is the only way to protect the health of all pond life from deteriorating water conditions. So, test don't guess. The API POND MASTER TEST KIT is the easy and accurate way to test pond water quality. This kit measures the 4 key water parameters: pH, ammonia, nitrite, and phosphate. Includes 6 bottles of liquid test reagent, computer-calibrated, laminated colour cards, 4 glass test tubes with snap-tight caps, holding tray, as well as a complete, step-by-step instruction booklet, including information on how to correct unsafe water. • Tests pH, Ammonia, Nitrite, and Phosphates • Fast, easy, & accurate • Conducts 500+ tests • Compact for home storage