For use with the aquachek trutest digital 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. For use with AquaChek Trutest Digital Reader; Digitally reads out margins for Free Chlorine/Bromine, pH and Total Alkalinity. 50 strips per bottle. AquaChek offers a full line of user-friendly products to help you keep home pools and spas safe for adults and kids alike.