• Pool tester for measuring pH from 6.8 to 8.2 and free chlorine with fine resolution from 0.1 to 1.0 mg/l and normal from 0.5 to 6.0 mg/l • Includes 30 free chlorine test tablets (DPD1) and 30 pH tablets (phenol red) • Fast-dissolving tablets for immediate results • Convenient storage box to keep the tablets organized • Chlorine/bromine and pH water tester with a total of 60 tablets • Rinse the tester with water and fill it up to the 10 ml mark before each use • To measure pH, add one phenol red tablet to the left measuring chamber • To measure free chlorine, add one DPD1 tablet to the corresponding measuring chamber • Close the lid and shake vigorously until the tablet is completely dissolved • Compare the resulting color with the device scale and read the values • Recommended reference values: pH between 7.2 and 7.4; free chlorine between 0.3 and 0.6 mg/l • It is recommended to measure pH and chlorine levels 1 to 2 times per week • Empty the tester after each measurement to maintain its accuracy