Description100 strips each. Testing for: Free Chlorine, Bromine, Total Chlorine, pH and Alkalinity.Designed specifically for on-site use by service pros, each vial contains 100 strips.Insta-Test PRO 400 measures Free Chlorine 0 to 10 ppm, Bromine 0 to 20 ppm, Total Chlorine 0 to 10 ppm, Alkalinity 0 to 240 ppm and pH 6.2 to 8.4 with instant results.Immerse strips for 2 seconds. Remove with pads face up. SHAKE ONCE TO REMOVE EXCESS WATER. Read immediately: FCI>TCI>Alk>pHThis test strip is a 1-Dip method. Just dip and read to get truly instant results—only by Insta-TEST!No swirling or waiting times, the new Insta-TEST 1-Dip formula feature extremely stable color reactions without cross-contaminated pads.100 Strips Per Bottle