The Care Free Test Kit will help you monitor and clean your hot tub water. This kit provides a specific test for free Chlorine and pH levels using the Titration (drops) method.  Including #1 DPH reagent and #2 DPD reagent and Phenol red for an accurate test for your water care program. 
 
To properly titrate (apply drops) while testing, reagent bottles need to be fully vertical during titration to ensure that the correct drop is produced.