2) Aquachek 512138 TruTest Digital Reader Swimming Pool Spa Test Strips Refills;

AquaChek® TruTest® Test Strips - Refill Item# 512138 100 Strips/Bottle Test for: Free Chlorine/Bromine, pH, and Alkalinity. For use with the AquaChek TruTest Digital Test Strip Reader. Bottles have a convenient flip top cap for easy dispensing! Just dip a test strip in your pool or spa, insert the strip into the meter and get fast accurate results! To keep your pool at its best, test at each end a minimum of twice a week. Tests for 3 important chemistries in seconds: Free Chlorine/Bromine, pH, Total Alkalinity.