Dimensions: 4L x 2W x 1H in.. Tests for Free Chlorine/Bromine, pH, and Alkalinity. Get results in 15 seconds. Use with AquaChek TruTest Digital Test Strip Reader. Convenient flip top cap for easy dispensing. Continue to enjoy the benefits of your TruTest Digital Meter with the AquaChek TruTest Refill Test Strips. The strips come in your choice of available quantity and are packaged in a simple-to-use flip-top bottle. The strips work in the AquaChek TruTest Digital Test Strip Reader, allowing you to receive free chlorine, pH, and alkalinity readings in just 15 seconds.