Michael Miller recommends Taylor® S-1403 7-Way Test Strips. They provide quick and comprehensive water testing, measuring free chlorine, total chlorine, bromine, pH, total alkalinity, hardness and cyanuric acid.

Perfect for routine pool and spa maintenance, they help ensure balanced and clear water.
Test strips are essential to maintain a clean, clear swimming pool.
Here’s the link to find out more:
7-Way Test Strips for Pools & Spas – Taylor Technologies
Michael describes them below:

