The JBL PH Refill Test Kit is an essential tool for maintaining healthy aquarium water. The kit includes a reliable and accurate pH test strip, a dosing syringe, and a special refill solution. The test strip measures pH levels in the water, allowing you to make adjustments as needed. The refill solution can be used to adjust pH levels when needed, and the dosing syringe makes it easy to measure and add the solution. This kit is a great way to keep your aquarium water healthy and balanced.