ENJOY AQUA Aquarium Water Quality Test Strips with Japanese Total pH 100 for Freshwater 6-in-1 Instructions, Hardness, Nitrate, Nitrite, Chlorine,

---------------------------------------------------------------------- Know when to change the water. This water quality test strip is easy even for beginners to use, allowing you to check six water qualities simultaneously in one step. No special equipment or complicated procedures are required: simply dip the test strip in water for 2 seconds to check. It measures six water quality parameters: nitrate, nitrite, chloride, total hardness, carbonate hardness, and pH. We recommend checking it once a week to maintain optimal water quality. For freshwater use, 100 uses, 25 tubes x 4 bags. Individually divided so they won't deteriorate and can be used for a long time. Use within 2 years if unopened, and within 90 days after opening. Know when to change the water. This water quality test strip is easy even for beginners to use, allowing you to check six water qualities simultaneously in one step.