All fish thrive at a particular pH level. pH can fluctuate due to fish waste; tap water and build-up of natural acids. This kit allows you to easily and accurately measure the pH level and maintain a healthy aquarium for your fish. The Freshwater pH Test Kit is fast easy and accurate. The kit contains a dropper bottle for accurate dispensing of test solutions; easy-to-read instructions and color chart; a non-staining glass test tube with a snap-tight cap; and instructions.