The Rainbow Pool and Spa Test Kit 2-in-1 is a convenient solution for testing both pH and chlorine levels in your pool or spa. This kit includes 1/2-ounce bottles of OTO (orthotolidine) for chlorine testing and pre-blended solution for pH measurement, with a chlorine range of 0.3 – 3.0. It comes in a sturdy blue hinged case for easy storage and transport, making it an essential tool for maintaining balanced and safe water chemistry in your pool or spa.