The TetraPond PH test kit allows the user to evaluate the PH level of their pond using a simple and accurate method.The PH value is one of the most important chemical properties of your pond water. All pond fish, plants and micro organisms are very sensitive to drastic or rapid changes in the PH level. A PH value of between 6.5 and 8.5 is considered suitable for almost all species of pond fish.Includes 25 Tests