Jed 2-Way Pool Test Kit Refill for #481. It comes with a blister-carded 1/2 ounce bottle of OTO and a 1/2 ounce bottle of Phenol Red solutions. These replacement testing reagents are ideal for testing Bromine, pH levels, and Chlorine.
WARNING: This product can expose you to chemicals including ortho-tolidine, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov