4-Pack Pool & Spa Frog Test Strips 10-ct x 4 (40 test strips total)
(4) 10-ct. Bottles Low-range Frog Spa Test Strips test for Frog Cartridge System. Measures Free Chlorine, Bromine, pH, and Total Alkalinity. Just dip a test strip in your pool or spa water and remove. You get test results in seconds.